Wrangler 4.0L cooling system capacity?
 

Hi all, could anybody tell me what the cooling system capacity of a
2000 Wrangler 4.0L is? I had my radiator leak about a month ago and
the dealer replaced it with a new one. The day after I picked it up, I
checked under the hood and noticed there was no antifreeze in the
overflow reservoir, so I filled it up and drove around and parked my
jeep . I checked again later after it had cooled down and it had
pulled all the coolant out of the reservoir down to the minimum level.
I filled the reservoir up to the maximum level and it has stayed there
since. I'm just wondering what the capacity is as I am concerned as to
how much colant the dealer did or didn't put in my radiator when they
replaced it and if I could have damaged anything by running with the
radiator low. My concern is ever since then my temp gauge has been
swinging up and down somewhat and will get warmer that it ever used
to. The temp gauge used to always be very steady except when it was
really hot in the summer and would creep up a bit when idling at stop
lights. Now it swings up and down. I am wondering if I may have
damaged my thermostat or temp sensor while running with low coolant
level. Also wondering if running 100% antifreeze could affect normal
running temp. I always see where it says to use 70% antifreeze / water
mix. When I filled it I used straight antifreeze. Could this affect
things? Any thoughts are most appreciated. The dealer blew me off when
I called them regarding not filling the radiator and said I probably
just had some air pockets in the system and don't worry about it, but
can't help but feel somethings is not right and needs attention. FWIW
it has been extremely cold here (low teens) and if anything I would
think the Jeep would run a little cooler and not hotter. If I'm crazy
tell me so, but any thoughts or suggestions would be most appreciated.
Thanks

Re: Wrangler 4.0L cooling system capacity?
 

Ouch!

Ok, you do not fill an empty system by filling the overflow bottle and
driving it with an empty engine and rad.

This will destroy the valve seals and fast turn your engine into an oil
burner that gives off a nasty puff of blue smoke every morning when
starting up. It also can crack the head and blow the head gasket.

You need to fill the rad with the engine running and the rad cap off.
Once full, you put the cap on and fill the overflow bottle.

'Pure' antifreeze will not cool an engine down and the engine 'will'
overheat leading to the above problems just like running empty does.

The strongest mix of antifreeze and water that is safe is 70% coolant,
30% water. This is for sub 0 F temps. In most areas 50/50 works fine.

The 70/30 will not work in the summer in traffic or when towing, it will
overheat. Folks that live in real cold winters and hot summers or tow,
swap coolant ratios for summer and winter.

Pure coolant just won't work. It won't transfer the heat away from the
metal. You can pick up a coolant tester for a couple bucks at
automotive stores that will tell you if you need to drain out some of
the 'thick' mix and add water.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

TJ Bittner wrote:
>
> Hi all, could anybody tell me what the cooling system capacity of a
> 2000 Wrangler 4.0L is? I had my radiator leak about a month ago and
> the dealer replaced it with a new one. The day after I picked it up, I
> checked under the hood and noticed there was no antifreeze in the
> overflow reservoir, so I filled it up and drove around and parked my
> jeep . I checked again later after it had cooled down and it had
> pulled all the coolant out of the reservoir down to the minimum level.
> I filled the reservoir up to the maximum level and it has stayed there
> since. I'm just wondering what the capacity is as I am concerned as to
> how much colant the dealer did or didn't put in my radiator when they
> replaced it and if I could have damaged anything by running with the
> radiator low. My concern is ever since then my temp gauge has been
> swinging up and down somewhat and will get warmer that it ever used
> to. The temp gauge used to always be very steady except when it was
> really hot in the summer and would creep up a bit when idling at stop
> lights. Now it swings up and down. I am wondering if I may have
> damaged my thermostat or temp sensor while running with low coolant
> level. Also wondering if running 100% antifreeze could affect normal
> running temp. I always see where it says to use 70% antifreeze / water
> mix. When I filled it I used straight antifreeze. Could this affect
> things? Any thoughts are most appreciated. The dealer blew me off when
> I called them regarding not filling the radiator and said I probably
> just had some air pockets in the system and don't worry about it, but
> can't help but feel somethings is not right and needs attention. FWIW
> it has been extremely cold here (low teens) and if anything I would
> think the Jeep would run a little cooler and not hotter. If I'm crazy
> tell me so, but any thoughts or suggestions would be most appreciated.
> Thanks

Re: Wrangler 4.0L cooling system capacity?
 

Ouch!

Ok, you do not fill an empty system by filling the overflow bottle and
driving it with an empty engine and rad.

This will destroy the valve seals and fast turn your engine into an oil
burner that gives off a nasty puff of blue smoke every morning when
starting up. It also can crack the head and blow the head gasket.

You need to fill the rad with the engine running and the rad cap off.
Once full, you put the cap on and fill the overflow bottle.

'Pure' antifreeze will not cool an engine down and the engine 'will'
overheat leading to the above problems just like running empty does.

The strongest mix of antifreeze and water that is safe is 70% coolant,
30% water. This is for sub 0 F temps. In most areas 50/50 works fine.

The 70/30 will not work in the summer in traffic or when towing, it will
overheat. Folks that live in real cold winters and hot summers or tow,
swap coolant ratios for summer and winter.

Pure coolant just won't work. It won't transfer the heat away from the
metal. You can pick up a coolant tester for a couple bucks at
automotive stores that will tell you if you need to drain out some of
the 'thick' mix and add water.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

TJ Bittner wrote:
>
> Hi all, could anybody tell me what the cooling system capacity of a
> 2000 Wrangler 4.0L is? I had my radiator leak about a month ago and
> the dealer replaced it with a new one. The day after I picked it up, I
> checked under the hood and noticed there was no antifreeze in the
> overflow reservoir, so I filled it up and drove around and parked my
> jeep . I checked again later after it had cooled down and it had
> pulled all the coolant out of the reservoir down to the minimum level.
> I filled the reservoir up to the maximum level and it has stayed there
> since. I'm just wondering what the capacity is as I am concerned as to
> how much colant the dealer did or didn't put in my radiator when they
> replaced it and if I could have damaged anything by running with the
> radiator low. My concern is ever since then my temp gauge has been
> swinging up and down somewhat and will get warmer that it ever used
> to. The temp gauge used to always be very steady except when it was
> really hot in the summer and would creep up a bit when idling at stop
> lights. Now it swings up and down. I am wondering if I may have
> damaged my thermostat or temp sensor while running with low coolant
> level. Also wondering if running 100% antifreeze could affect normal
> running temp. I always see where it says to use 70% antifreeze / water
> mix. When I filled it I used straight antifreeze. Could this affect
> things? Any thoughts are most appreciated. The dealer blew me off when
> I called them regarding not filling the radiator and said I probably
> just had some air pockets in the system and don't worry about it, but
> can't help but feel somethings is not right and needs attention. FWIW
> it has been extremely cold here (low teens) and if anything I would
> think the Jeep would run a little cooler and not hotter. If I'm crazy
> tell me so, but any thoughts or suggestions would be most appreciated.
> Thanks

Re: Wrangler 4.0L cooling system capacity?
 

Ouch!

Ok, you do not fill an empty system by filling the overflow bottle and
driving it with an empty engine and rad.

This will destroy the valve seals and fast turn your engine into an oil
burner that gives off a nasty puff of blue smoke every morning when
starting up. It also can crack the head and blow the head gasket.

You need to fill the rad with the engine running and the rad cap off.
Once full, you put the cap on and fill the overflow bottle.

'Pure' antifreeze will not cool an engine down and the engine 'will'
overheat leading to the above problems just like running empty does.

The strongest mix of antifreeze and water that is safe is 70% coolant,
30% water. This is for sub 0 F temps. In most areas 50/50 works fine.

The 70/30 will not work in the summer in traffic or when towing, it will
overheat. Folks that live in real cold winters and hot summers or tow,
swap coolant ratios for summer and winter.

Pure coolant just won't work. It won't transfer the heat away from the
metal. You can pick up a coolant tester for a couple bucks at
automotive stores that will tell you if you need to drain out some of
the 'thick' mix and add water.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

TJ Bittner wrote:
>
> Hi all, could anybody tell me what the cooling system capacity of a
> 2000 Wrangler 4.0L is? I had my radiator leak about a month ago and
> the dealer replaced it with a new one. The day after I picked it up, I
> checked under the hood and noticed there was no antifreeze in the
> overflow reservoir, so I filled it up and drove around and parked my
> jeep . I checked again later after it had cooled down and it had
> pulled all the coolant out of the reservoir down to the minimum level.
> I filled the reservoir up to the maximum level and it has stayed there
> since. I'm just wondering what the capacity is as I am concerned as to
> how much colant the dealer did or didn't put in my radiator when they
> replaced it and if I could have damaged anything by running with the
> radiator low. My concern is ever since then my temp gauge has been
> swinging up and down somewhat and will get warmer that it ever used
> to. The temp gauge used to always be very steady except when it was
> really hot in the summer and would creep up a bit when idling at stop
> lights. Now it swings up and down. I am wondering if I may have
> damaged my thermostat or temp sensor while running with low coolant
> level. Also wondering if running 100% antifreeze could affect normal
> running temp. I always see where it says to use 70% antifreeze / water
> mix. When I filled it I used straight antifreeze. Could this affect
> things? Any thoughts are most appreciated. The dealer blew me off when
> I called them regarding not filling the radiator and said I probably
> just had some air pockets in the system and don't worry about it, but
> can't help but feel somethings is not right and needs attention. FWIW
> it has been extremely cold here (low teens) and if anything I would
> think the Jeep would run a little cooler and not hotter. If I'm crazy
> tell me so, but any thoughts or suggestions would be most appreciated.
> Thanks

Re: Wrangler 4.0L cooling system capacity?
 

"Mike Romain" <romainm@sympatico.ca> wrote in message
news:4017CF9F.2532988C@sympatico.ca...
> Ouch!
>
> Ok, you do not fill an empty system by filling the overflow bottle and
> driving it with an empty engine and rad.
>
> This will destroy the valve seals and fast turn your engine into an oil
> burner that gives off a nasty puff of blue smoke every morning when
> starting up. It also can crack the head and blow the head gasket.
>
> You need to fill the rad with the engine running and the rad cap off.
> Once full, you put the cap on and fill the overflow bottle.
>
> 'Pure' antifreeze will not cool an engine down and the engine 'will'
> overheat leading to the above problems just like running empty does.
>
> The strongest mix of antifreeze and water that is safe is 70% coolant,
> 30% water. This is for sub 0 F temps. In most areas 50/50 works fine.
>
> The 70/30 will not work in the summer in traffic or when towing, it will
> overheat. Folks that live in real cold winters and hot summers or tow,
> swap coolant ratios for summer and winter.

Mike:
I'm curious as to where this idea came from. A heat transfer graph
of an Antifreeze-distilled water mixture will show the ability to "throw
off" heat increases as the Antifreeze component is increased up to about the
73-75% level. Beyond that (higher % of Antifreeze) the ability starts to
drop drastically. As a result, the first thing we would do when prepping
vehicles for parade duty in hot weather was to ensure the fill ratio was at
the 75% level to ensure maximum heat transfer through the rads.
Also, since factory fills are, in most cases, around the 50-50
level, topping up with small amounts of undiluted ("pure") Antifreeze is
acceptable (with the caveat of not exceeding the 75% level).

Bob


>
> Pure coolant just won't work. It won't transfer the heat away from the
> metal. You can pick up a coolant tester for a couple bucks at
> automotive stores that will tell you if you need to drain out some of
> the 'thick' mix and add water.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> TJ Bittner wrote:
> >
> > Hi all, could anybody tell me what the cooling system capacity of a
> > 2000 Wrangler 4.0L is? I had my radiator leak about a month ago and
> > the dealer replaced it with a new one. The day after I picked it up, I
> > checked under the hood and noticed there was no antifreeze in the
> > overflow reservoir, so I filled it up and drove around and parked my
> > jeep . I checked again later after it had cooled down and it had
> > pulled all the coolant out of the reservoir down to the minimum level.
> > I filled the reservoir up to the maximum level and it has stayed there
> > since. I'm just wondering what the capacity is as I am concerned as to
> > how much colant the dealer did or didn't put in my radiator when they
> > replaced it and if I could have damaged anything by running with the
> > radiator low. My concern is ever since then my temp gauge has been
> > swinging up and down somewhat and will get warmer that it ever used
> > to. The temp gauge used to always be very steady except when it was
> > really hot in the summer and would creep up a bit when idling at stop
> > lights. Now it swings up and down. I am wondering if I may have
> > damaged my thermostat or temp sensor while running with low coolant
> > level. Also wondering if running 100% antifreeze could affect normal
> > running temp. I always see where it says to use 70% antifreeze / water
> > mix. When I filled it I used straight antifreeze. Could this affect
> > things? Any thoughts are most appreciated. The dealer blew me off when
> > I called them regarding not filling the radiator and said I probably
> > just had some air pockets in the system and don't worry about it, but
> > can't help but feel somethings is not right and needs attention. FWIW
> > it has been extremely cold here (low teens) and if anything I would
> > think the Jeep would run a little cooler and not hotter. If I'm crazy
> > tell me so, but any thoughts or suggestions would be most appreciated.
> > Thanks

Re: Wrangler 4.0L cooling system capacity?
 

"Mike Romain" <romainm@sympatico.ca> wrote in message
news:4017CF9F.2532988C@sympatico.ca...
> Ouch!
>
> Ok, you do not fill an empty system by filling the overflow bottle and
> driving it with an empty engine and rad.
>
> This will destroy the valve seals and fast turn your engine into an oil
> burner that gives off a nasty puff of blue smoke every morning when
> starting up. It also can crack the head and blow the head gasket.
>
> You need to fill the rad with the engine running and the rad cap off.
> Once full, you put the cap on and fill the overflow bottle.
>
> 'Pure' antifreeze will not cool an engine down and the engine 'will'
> overheat leading to the above problems just like running empty does.
>
> The strongest mix of antifreeze and water that is safe is 70% coolant,
> 30% water. This is for sub 0 F temps. In most areas 50/50 works fine.
>
> The 70/30 will not work in the summer in traffic or when towing, it will
> overheat. Folks that live in real cold winters and hot summers or tow,
> swap coolant ratios for summer and winter.

Mike:
I'm curious as to where this idea came from. A heat transfer graph
of an Antifreeze-distilled water mixture will show the ability to "throw
off" heat increases as the Antifreeze component is increased up to about the
73-75% level. Beyond that (higher % of Antifreeze) the ability starts to
drop drastically. As a result, the first thing we would do when prepping
vehicles for parade duty in hot weather was to ensure the fill ratio was at
the 75% level to ensure maximum heat transfer through the rads.
Also, since factory fills are, in most cases, around the 50-50
level, topping up with small amounts of undiluted ("pure") Antifreeze is
acceptable (with the caveat of not exceeding the 75% level).

Bob


>
> Pure coolant just won't work. It won't transfer the heat away from the
> metal. You can pick up a coolant tester for a couple bucks at
> automotive stores that will tell you if you need to drain out some of
> the 'thick' mix and add water.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> TJ Bittner wrote:
> >
> > Hi all, could anybody tell me what the cooling system capacity of a
> > 2000 Wrangler 4.0L is? I had my radiator leak about a month ago and
> > the dealer replaced it with a new one. The day after I picked it up, I
> > checked under the hood and noticed there was no antifreeze in the
> > overflow reservoir, so I filled it up and drove around and parked my
> > jeep . I checked again later after it had cooled down and it had
> > pulled all the coolant out of the reservoir down to the minimum level.
> > I filled the reservoir up to the maximum level and it has stayed there
> > since. I'm just wondering what the capacity is as I am concerned as to
> > how much colant the dealer did or didn't put in my radiator when they
> > replaced it and if I could have damaged anything by running with the
> > radiator low. My concern is ever since then my temp gauge has been
> > swinging up and down somewhat and will get warmer that it ever used
> > to. The temp gauge used to always be very steady except when it was
> > really hot in the summer and would creep up a bit when idling at stop
> > lights. Now it swings up and down. I am wondering if I may have
> > damaged my thermostat or temp sensor while running with low coolant
> > level. Also wondering if running 100% antifreeze could affect normal
> > running temp. I always see where it says to use 70% antifreeze / water
> > mix. When I filled it I used straight antifreeze. Could this affect
> > things? Any thoughts are most appreciated. The dealer blew me off when
> > I called them regarding not filling the radiator and said I probably
> > just had some air pockets in the system and don't worry about it, but
> > can't help but feel somethings is not right and needs attention. FWIW
> > it has been extremely cold here (low teens) and if anything I would
> > think the Jeep would run a little cooler and not hotter. If I'm crazy
> > tell me so, but any thoughts or suggestions would be most appreciated.
> > Thanks

Re: Wrangler 4.0L cooling system capacity?
 

"Mike Romain" <romainm@sympatico.ca> wrote in message
news:4017CF9F.2532988C@sympatico.ca...
> Ouch!
>
> Ok, you do not fill an empty system by filling the overflow bottle and
> driving it with an empty engine and rad.
>
> This will destroy the valve seals and fast turn your engine into an oil
> burner that gives off a nasty puff of blue smoke every morning when
> starting up. It also can crack the head and blow the head gasket.
>
> You need to fill the rad with the engine running and the rad cap off.
> Once full, you put the cap on and fill the overflow bottle.
>
> 'Pure' antifreeze will not cool an engine down and the engine 'will'
> overheat leading to the above problems just like running empty does.
>
> The strongest mix of antifreeze and water that is safe is 70% coolant,
> 30% water. This is for sub 0 F temps. In most areas 50/50 works fine.
>
> The 70/30 will not work in the summer in traffic or when towing, it will
> overheat. Folks that live in real cold winters and hot summers or tow,
> swap coolant ratios for summer and winter.

Mike:
I'm curious as to where this idea came from. A heat transfer graph
of an Antifreeze-distilled water mixture will show the ability to "throw
off" heat increases as the Antifreeze component is increased up to about the
73-75% level. Beyond that (higher % of Antifreeze) the ability starts to
drop drastically. As a result, the first thing we would do when prepping
vehicles for parade duty in hot weather was to ensure the fill ratio was at
the 75% level to ensure maximum heat transfer through the rads.
Also, since factory fills are, in most cases, around the 50-50
level, topping up with small amounts of undiluted ("pure") Antifreeze is
acceptable (with the caveat of not exceeding the 75% level).

Bob


>
> Pure coolant just won't work. It won't transfer the heat away from the
> metal. You can pick up a coolant tester for a couple bucks at
> automotive stores that will tell you if you need to drain out some of
> the 'thick' mix and add water.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> TJ Bittner wrote:
> >
> > Hi all, could anybody tell me what the cooling system capacity of a
> > 2000 Wrangler 4.0L is? I had my radiator leak about a month ago and
> > the dealer replaced it with a new one. The day after I picked it up, I
> > checked under the hood and noticed there was no antifreeze in the
> > overflow reservoir, so I filled it up and drove around and parked my
> > jeep . I checked again later after it had cooled down and it had
> > pulled all the coolant out of the reservoir down to the minimum level.
> > I filled the reservoir up to the maximum level and it has stayed there
> > since. I'm just wondering what the capacity is as I am concerned as to
> > how much colant the dealer did or didn't put in my radiator when they
> > replaced it and if I could have damaged anything by running with the
> > radiator low. My concern is ever since then my temp gauge has been
> > swinging up and down somewhat and will get warmer that it ever used
> > to. The temp gauge used to always be very steady except when it was
> > really hot in the summer and would creep up a bit when idling at stop
> > lights. Now it swings up and down. I am wondering if I may have
> > damaged my thermostat or temp sensor while running with low coolant
> > level. Also wondering if running 100% antifreeze could affect normal
> > running temp. I always see where it says to use 70% antifreeze / water
> > mix. When I filled it I used straight antifreeze. Could this affect
> > things? Any thoughts are most appreciated. The dealer blew me off when
> > I called them regarding not filling the radiator and said I probably
> > just had some air pockets in the system and don't worry about it, but
> > can't help but feel somethings is not right and needs attention. FWIW
> > it has been extremely cold here (low teens) and if anything I would
> > think the Jeep would run a little cooler and not hotter. If I'm crazy
> > tell me so, but any thoughts or suggestions would be most appreciated.
> > Thanks

Re: Wrangler 4.0L cooling system capacity?
 

Robert Brace wrote:
>
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:4017CF9F.2532988C@sympatico.ca...
> > Ouch!
> >
> > Ok, you do not fill an empty system by filling the overflow bottle and
> > driving it with an empty engine and rad.
> >
> > This will destroy the valve seals and fast turn your engine into an oil
> > burner that gives off a nasty puff of blue smoke every morning when
> > starting up. It also can crack the head and blow the head gasket.
> >
> > You need to fill the rad with the engine running and the rad cap off.
> > Once full, you put the cap on and fill the overflow bottle.
> >
> > 'Pure' antifreeze will not cool an engine down and the engine 'will'
> > overheat leading to the above problems just like running empty does.
> >
> > The strongest mix of antifreeze and water that is safe is 70% coolant,
> > 30% water. This is for sub 0 F temps. In most areas 50/50 works fine.
> >
> > The 70/30 will not work in the summer in traffic or when towing, it will
> > overheat. Folks that live in real cold winters and hot summers or tow,
> > swap coolant ratios for summer and winter.
>
> Mike:
> I'm curious as to where this idea came from. A heat transfer graph
> of an Antifreeze-distilled water mixture will show the ability to "throw
> off" heat increases as the Antifreeze component is increased up to about the
> 73-75% level. Beyond that (higher % of Antifreeze) the ability starts to
> drop drastically. As a result, the first thing we would do when prepping
> vehicles for parade duty in hot weather was to ensure the fill ratio was at
> the 75% level to ensure maximum heat transfer through the rads.
> Also, since factory fills are, in most cases, around the 50-50
> level, topping up with small amounts of undiluted ("pure") Antifreeze is
> acceptable (with the caveat of not exceeding the 75% level).
>
> Bob

From experience working in garages and from observation. I used to
change lots of systems from 70/30 to 50/50 and back because seasonally
of the overheating complaints from folks that tow and get stuck in
traffic.

I don't know where you got your data, but a fast search on the net and
the first ding gets me this:

A mix of water and antifreeze EXCEEDING the 50\50 ratio (say 70\30)
increases the freeze point protection down to -72 degrees F., but at
the
same time, it will reduce the cooling efficiency of the system. And,
when the
weather warms, such a 70\30 mix could cause the Engine to overheat.

From: http://www.marinemechanic.com/site/page39.html

Mike


>
> >
> > Pure coolant just won't work. It won't transfer the heat away from the
> > metal. You can pick up a coolant tester for a couple bucks at
> > automotive stores that will tell you if you need to drain out some of
> > the 'thick' mix and add water.
> >
> > Mike
> > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > 88 Cherokee 235 BFG AT's
> >
> > TJ Bittner wrote:
> > >
> > > Hi all, could anybody tell me what the cooling system capacity of a
> > > 2000 Wrangler 4.0L is? I had my radiator leak about a month ago and
> > > the dealer replaced it with a new one. The day after I picked it up, I
> > > checked under the hood and noticed there was no antifreeze in the
> > > overflow reservoir, so I filled it up and drove around and parked my
> > > jeep . I checked again later after it had cooled down and it had
> > > pulled all the coolant out of the reservoir down to the minimum level.
> > > I filled the reservoir up to the maximum level and it has stayed there
> > > since. I'm just wondering what the capacity is as I am concerned as to
> > > how much colant the dealer did or didn't put in my radiator when they
> > > replaced it and if I could have damaged anything by running with the
> > > radiator low. My concern is ever since then my temp gauge has been
> > > swinging up and down somewhat and will get warmer that it ever used
> > > to. The temp gauge used to always be very steady except when it was
> > > really hot in the summer and would creep up a bit when idling at stop
> > > lights. Now it swings up and down. I am wondering if I may have
> > > damaged my thermostat or temp sensor while running with low coolant
> > > level. Also wondering if running 100% antifreeze could affect normal
> > > running temp. I always see where it says to use 70% antifreeze / water
> > > mix. When I filled it I used straight antifreeze. Could this affect
> > > things? Any thoughts are most appreciated. The dealer blew me off when
> > > I called them regarding not filling the radiator and said I probably
> > > just had some air pockets in the system and don't worry about it, but
> > > can't help but feel somethings is not right and needs attention. FWIW
> > > it has been extremely cold here (low teens) and if anything I would
> > > think the Jeep would run a little cooler and not hotter. If I'm crazy
> > > tell me so, but any thoughts or suggestions would be most appreciated.
> > > Thanks

Re: Wrangler 4.0L cooling system capacity?
 

Robert Brace wrote:
>
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:4017CF9F.2532988C@sympatico.ca...
> > Ouch!
> >
> > Ok, you do not fill an empty system by filling the overflow bottle and
> > driving it with an empty engine and rad.
> >
> > This will destroy the valve seals and fast turn your engine into an oil
> > burner that gives off a nasty puff of blue smoke every morning when
> > starting up. It also can crack the head and blow the head gasket.
> >
> > You need to fill the rad with the engine running and the rad cap off.
> > Once full, you put the cap on and fill the overflow bottle.
> >
> > 'Pure' antifreeze will not cool an engine down and the engine 'will'
> > overheat leading to the above problems just like running empty does.
> >
> > The strongest mix of antifreeze and water that is safe is 70% coolant,
> > 30% water. This is for sub 0 F temps. In most areas 50/50 works fine.
> >
> > The 70/30 will not work in the summer in traffic or when towing, it will
> > overheat. Folks that live in real cold winters and hot summers or tow,
> > swap coolant ratios for summer and winter.
>
> Mike:
> I'm curious as to where this idea came from. A heat transfer graph
> of an Antifreeze-distilled water mixture will show the ability to "throw
> off" heat increases as the Antifreeze component is increased up to about the
> 73-75% level. Beyond that (higher % of Antifreeze) the ability starts to
> drop drastically. As a result, the first thing we would do when prepping
> vehicles for parade duty in hot weather was to ensure the fill ratio was at
> the 75% level to ensure maximum heat transfer through the rads.
> Also, since factory fills are, in most cases, around the 50-50
> level, topping up with small amounts of undiluted ("pure") Antifreeze is
> acceptable (with the caveat of not exceeding the 75% level).
>
> Bob

From experience working in garages and from observation. I used to
change lots of systems from 70/30 to 50/50 and back because seasonally
of the overheating complaints from folks that tow and get stuck in
traffic.

I don't know where you got your data, but a fast search on the net and
the first ding gets me this:

A mix of water and antifreeze EXCEEDING the 50\50 ratio (say 70\30)
increases the freeze point protection down to -72 degrees F., but at
the
same time, it will reduce the cooling efficiency of the system. And,
when the
weather warms, such a 70\30 mix could cause the Engine to overheat.

From: http://www.marinemechanic.com/site/page39.html

Mike


>
> >
> > Pure coolant just won't work. It won't transfer the heat away from the
> > metal. You can pick up a coolant tester for a couple bucks at
> > automotive stores that will tell you if you need to drain out some of
> > the 'thick' mix and add water.
> >
> > Mike
> > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > 88 Cherokee 235 BFG AT's
> >
> > TJ Bittner wrote:
> > >
> > > Hi all, could anybody tell me what the cooling system capacity of a
> > > 2000 Wrangler 4.0L is? I had my radiator leak about a month ago and
> > > the dealer replaced it with a new one. The day after I picked it up, I
> > > checked under the hood and noticed there was no antifreeze in the
> > > overflow reservoir, so I filled it up and drove around and parked my
> > > jeep . I checked again later after it had cooled down and it had
> > > pulled all the coolant out of the reservoir down to the minimum level.
> > > I filled the reservoir up to the maximum level and it has stayed there
> > > since. I'm just wondering what the capacity is as I am concerned as to
> > > how much colant the dealer did or didn't put in my radiator when they
> > > replaced it and if I could have damaged anything by running with the
> > > radiator low. My concern is ever since then my temp gauge has been
> > > swinging up and down somewhat and will get warmer that it ever used
> > > to. The temp gauge used to always be very steady except when it was
> > > really hot in the summer and would creep up a bit when idling at stop
> > > lights. Now it swings up and down. I am wondering if I may have
> > > damaged my thermostat or temp sensor while running with low coolant
> > > level. Also wondering if running 100% antifreeze could affect normal
> > > running temp. I always see where it says to use 70% antifreeze / water
> > > mix. When I filled it I used straight antifreeze. Could this affect
> > > things? Any thoughts are most appreciated. The dealer blew me off when
> > > I called them regarding not filling the radiator and said I probably
> > > just had some air pockets in the system and don't worry about it, but
> > > can't help but feel somethings is not right and needs attention. FWIW
> > > it has been extremely cold here (low teens) and if anything I would
> > > think the Jeep would run a little cooler and not hotter. If I'm crazy
> > > tell me so, but any thoughts or suggestions would be most appreciated.
> > > Thanks

Re: Wrangler 4.0L cooling system capacity?
 

Robert Brace wrote:
>
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:4017CF9F.2532988C@sympatico.ca...
> > Ouch!
> >
> > Ok, you do not fill an empty system by filling the overflow bottle and
> > driving it with an empty engine and rad.
> >
> > This will destroy the valve seals and fast turn your engine into an oil
> > burner that gives off a nasty puff of blue smoke every morning when
> > starting up. It also can crack the head and blow the head gasket.
> >
> > You need to fill the rad with the engine running and the rad cap off.
> > Once full, you put the cap on and fill the overflow bottle.
> >
> > 'Pure' antifreeze will not cool an engine down and the engine 'will'
> > overheat leading to the above problems just like running empty does.
> >
> > The strongest mix of antifreeze and water that is safe is 70% coolant,
> > 30% water. This is for sub 0 F temps. In most areas 50/50 works fine.
> >
> > The 70/30 will not work in the summer in traffic or when towing, it will
> > overheat. Folks that live in real cold winters and hot summers or tow,
> > swap coolant ratios for summer and winter.
>
> Mike:
> I'm curious as to where this idea came from. A heat transfer graph
> of an Antifreeze-distilled water mixture will show the ability to "throw
> off" heat increases as the Antifreeze component is increased up to about the
> 73-75% level. Beyond that (higher % of Antifreeze) the ability starts to
> drop drastically. As a result, the first thing we would do when prepping
> vehicles for parade duty in hot weather was to ensure the fill ratio was at
> the 75% level to ensure maximum heat transfer through the rads.
> Also, since factory fills are, in most cases, around the 50-50
> level, topping up with small amounts of undiluted ("pure") Antifreeze is
> acceptable (with the caveat of not exceeding the 75% level).
>
> Bob

From experience working in garages and from observation. I used to
change lots of systems from 70/30 to 50/50 and back because seasonally
of the overheating complaints from folks that tow and get stuck in
traffic.

I don't know where you got your data, but a fast search on the net and
the first ding gets me this:

A mix of water and antifreeze EXCEEDING the 50\50 ratio (say 70\30)
increases the freeze point protection down to -72 degrees F., but at
the
same time, it will reduce the cooling efficiency of the system. And,
when the
weather warms, such a 70\30 mix could cause the Engine to overheat.

From: http://www.marinemechanic.com/site/page39.html

Mike


>
> >
> > Pure coolant just won't work. It won't transfer the heat away from the
> > metal. You can pick up a coolant tester for a couple bucks at
> > automotive stores that will tell you if you need to drain out some of
> > the 'thick' mix and add water.
> >
> > Mike
> > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > 88 Cherokee 235 BFG AT's
> >
> > TJ Bittner wrote:
> > >
> > > Hi all, could anybody tell me what the cooling system capacity of a
> > > 2000 Wrangler 4.0L is? I had my radiator leak about a month ago and
> > > the dealer replaced it with a new one. The day after I picked it up, I
> > > checked under the hood and noticed there was no antifreeze in the
> > > overflow reservoir, so I filled it up and drove around and parked my
> > > jeep . I checked again later after it had cooled down and it had
> > > pulled all the coolant out of the reservoir down to the minimum level.
> > > I filled the reservoir up to the maximum level and it has stayed there
> > > since. I'm just wondering what the capacity is as I am concerned as to
> > > how much colant the dealer did or didn't put in my radiator when they
> > > replaced it and if I could have damaged anything by running with the
> > > radiator low. My concern is ever since then my temp gauge has been
> > > swinging up and down somewhat and will get warmer that it ever used
> > > to. The temp gauge used to always be very steady except when it was
> > > really hot in the summer and would creep up a bit when idling at stop
> > > lights. Now it swings up and down. I am wondering if I may have
> > > damaged my thermostat or temp sensor while running with low coolant
> > > level. Also wondering if running 100% antifreeze could affect normal
> > > running temp. I always see where it says to use 70% antifreeze / water
> > > mix. When I filled it I used straight antifreeze. Could this affect
> > > things? Any thoughts are most appreciated. The dealer blew me off when
> > > I called them regarding not filling the radiator and said I probably
> > > just had some air pockets in the system and don't worry about it, but
> > > can't help but feel somethings is not right and needs attention. FWIW
> > > it has been extremely cold here (low teens) and if anything I would
> > > think the Jeep would run a little cooler and not hotter. If I'm crazy
> > > tell me so, but any thoughts or suggestions would be most appreciated.
> > > Thanks