loren.betts@gmail.com did pass the time by typing:
> Hi All,
>
> Here's a good one. Bought used Jeep 2000 wrangler with 4L. Over the
> past few years replaced radiator, thermostat, water pump. Now I have a
> mysterious coolant loss. No visible leaks. Did compression test (not
> leak down). All cyclinders are 185 +- 10 psi.
>
> What I noticed is that if I take the rad cap off and start the
> engine...as it warms up the coolant starts to rise out of the top.
> When I rev up the motor the coolant goes down and does not over flow.
> However if I then release the throttle the coolant rises and over
> flows. I then watched more closely at it looks like there are bubbles
> that come up ver so often.
>
> This to me is pointing to a bad head gasket or head.


Gonna give you another thing to look at. Especially if you
don't have water in the oil or a grey cloud following you,
I'd suspect a leak in the overflow system.

The coolant system in your jeep is a closed/airless system. i.e. the
coolant should be even with the radiator cap when you take the cap off
a cold radiator. The overflow bottle should have a low and high mark.
With the engine cold the coolant should be about in the middle or just
a bit below the high mark.

What can happen is a crack in the overflow bottle or in the hose that
runs to it. As you drive the expansion drives some coolant out and it
dribbles down on the road. When the engine cools down air (rather
than coolant) gets sucked back into the system.

As air gets into the system this problem gets progressively worse.

You check the overflow bottle by filling it up. and looking for leaks
Generally what ever is remaining indicates where the crack is. The
hose is just a matter of looking.


--
DougW

 

loren.betts@gmail.com did pass the time by typing:
> Hi All,
>
> Here's a good one. Bought used Jeep 2000 wrangler with 4L. Over the
> past few years replaced radiator, thermostat, water pump. Now I have a
> mysterious coolant loss. No visible leaks. Did compression test (not
> leak down). All cyclinders are 185 +- 10 psi.
>
> What I noticed is that if I take the rad cap off and start the
> engine...as it warms up the coolant starts to rise out of the top.
> When I rev up the motor the coolant goes down and does not over flow.
> However if I then release the throttle the coolant rises and over
> flows. I then watched more closely at it looks like there are bubbles
> that come up ver so often.
>
> This to me is pointing to a bad head gasket or head.


Gonna give you another thing to look at. Especially if you
don't have water in the oil or a grey cloud following you,
I'd suspect a leak in the overflow system.

The coolant system in your jeep is a closed/airless system. i.e. the
coolant should be even with the radiator cap when you take the cap off
a cold radiator. The overflow bottle should have a low and high mark.
With the engine cold the coolant should be about in the middle or just
a bit below the high mark.

What can happen is a crack in the overflow bottle or in the hose that
runs to it. As you drive the expansion drives some coolant out and it
dribbles down on the road. When the engine cools down air (rather
than coolant) gets sucked back into the system.

As air gets into the system this problem gets progressively worse.

You check the overflow bottle by filling it up. and looking for leaks
Generally what ever is remaining indicates where the crack is. The
hose is just a matter of looking.


--
DougW

 

loren.betts@gmail.com did pass the time by typing:
> Hi All,
>
> Here's a good one. Bought used Jeep 2000 wrangler with 4L. Over the
> past few years replaced radiator, thermostat, water pump. Now I have a
> mysterious coolant loss. No visible leaks. Did compression test (not
> leak down). All cyclinders are 185 +- 10 psi.
>
> What I noticed is that if I take the rad cap off and start the
> engine...as it warms up the coolant starts to rise out of the top.
> When I rev up the motor the coolant goes down and does not over flow.
> However if I then release the throttle the coolant rises and over
> flows. I then watched more closely at it looks like there are bubbles
> that come up ver so often.
>
> This to me is pointing to a bad head gasket or head.


Gonna give you another thing to look at. Especially if you
don't have water in the oil or a grey cloud following you,
I'd suspect a leak in the overflow system.

The coolant system in your jeep is a closed/airless system. i.e. the
coolant should be even with the radiator cap when you take the cap off
a cold radiator. The overflow bottle should have a low and high mark.
With the engine cold the coolant should be about in the middle or just
a bit below the high mark.

What can happen is a crack in the overflow bottle or in the hose that
runs to it. As you drive the expansion drives some coolant out and it
dribbles down on the road. When the engine cools down air (rather
than coolant) gets sucked back into the system.

As air gets into the system this problem gets progressively worse.

You check the overflow bottle by filling it up. and looking for leaks
Generally what ever is remaining indicates where the crack is. The
hose is just a matter of looking.


--
DougW

 

Thanks for the great ideas. The coolant is not bubbling like the
picture. It is more like a burp.

I will double check the over flow bottle and hose. I can go through a
liter of coolant in around 1.5 weeks.

There definately are no visible leaks on the over flow...what I mean is
nothing is leaking on the ground.


DougW wrote:
> loren.betts@gmail.com did pass the time by typing:
> > Hi All,
> >
> > Here's a good one. Bought used Jeep 2000 wrangler with 4L. Over the
> > past few years replaced radiator, thermostat, water pump. Now I have a
> > mysterious coolant loss. No visible leaks. Did compression test (not
> > leak down). All cyclinders are 185 +- 10 psi.
> >
> > What I noticed is that if I take the rad cap off and start the
> > engine...as it warms up the coolant starts to rise out of the top.
> > When I rev up the motor the coolant goes down and does not over flow.
> > However if I then release the throttle the coolant rises and over
> > flows. I then watched more closely at it looks like there are bubbles
> > that come up ver so often.
> >
> > This to me is pointing to a bad head gasket or head.
>
>
> Gonna give you another thing to look at. Especially if you
> don't have water in the oil or a grey cloud following you,
> I'd suspect a leak in the overflow system.
>
> The coolant system in your jeep is a closed/airless system. i.e. the
> coolant should be even with the radiator cap when you take the cap off
> a cold radiator. The overflow bottle should have a low and high mark.
> With the engine cold the coolant should be about in the middle or just
> a bit below the high mark.
>
> What can happen is a crack in the overflow bottle or in the hose that
> runs to it. As you drive the expansion drives some coolant out and it
> dribbles down on the road. When the engine cools down air (rather
> than coolant) gets sucked back into the system.
>
> As air gets into the system this problem gets progressively worse.
>
> You check the overflow bottle by filling it up. and looking for leaks
> Generally what ever is remaining indicates where the crack is. The
> hose is just a matter of looking.
>
>
> --
> DougW

 

Thanks for the great ideas. The coolant is not bubbling like the
picture. It is more like a burp.

I will double check the over flow bottle and hose. I can go through a
liter of coolant in around 1.5 weeks.

There definately are no visible leaks on the over flow...what I mean is
nothing is leaking on the ground.


DougW wrote:
> loren.betts@gmail.com did pass the time by typing:
> > Hi All,
> >
> > Here's a good one. Bought used Jeep 2000 wrangler with 4L. Over the
> > past few years replaced radiator, thermostat, water pump. Now I have a
> > mysterious coolant loss. No visible leaks. Did compression test (not
> > leak down). All cyclinders are 185 +- 10 psi.
> >
> > What I noticed is that if I take the rad cap off and start the
> > engine...as it warms up the coolant starts to rise out of the top.
> > When I rev up the motor the coolant goes down and does not over flow.
> > However if I then release the throttle the coolant rises and over
> > flows. I then watched more closely at it looks like there are bubbles
> > that come up ver so often.
> >
> > This to me is pointing to a bad head gasket or head.
>
>
> Gonna give you another thing to look at. Especially if you
> don't have water in the oil or a grey cloud following you,
> I'd suspect a leak in the overflow system.
>
> The coolant system in your jeep is a closed/airless system. i.e. the
> coolant should be even with the radiator cap when you take the cap off
> a cold radiator. The overflow bottle should have a low and high mark.
> With the engine cold the coolant should be about in the middle or just
> a bit below the high mark.
>
> What can happen is a crack in the overflow bottle or in the hose that
> runs to it. As you drive the expansion drives some coolant out and it
> dribbles down on the road. When the engine cools down air (rather
> than coolant) gets sucked back into the system.
>
> As air gets into the system this problem gets progressively worse.
>
> You check the overflow bottle by filling it up. and looking for leaks
> Generally what ever is remaining indicates where the crack is. The
> hose is just a matter of looking.
>
>
> --
> DougW

 

Thanks for the great ideas. The coolant is not bubbling like the
picture. It is more like a burp.

I will double check the over flow bottle and hose. I can go through a
liter of coolant in around 1.5 weeks.

There definately are no visible leaks on the over flow...what I mean is
nothing is leaking on the ground.


DougW wrote:
> loren.betts@gmail.com did pass the time by typing:
> > Hi All,
> >
> > Here's a good one. Bought used Jeep 2000 wrangler with 4L. Over the
> > past few years replaced radiator, thermostat, water pump. Now I have a
> > mysterious coolant loss. No visible leaks. Did compression test (not
> > leak down). All cyclinders are 185 +- 10 psi.
> >
> > What I noticed is that if I take the rad cap off and start the
> > engine...as it warms up the coolant starts to rise out of the top.
> > When I rev up the motor the coolant goes down and does not over flow.
> > However if I then release the throttle the coolant rises and over
> > flows. I then watched more closely at it looks like there are bubbles
> > that come up ver so often.
> >
> > This to me is pointing to a bad head gasket or head.
>
>
> Gonna give you another thing to look at. Especially if you
> don't have water in the oil or a grey cloud following you,
> I'd suspect a leak in the overflow system.
>
> The coolant system in your jeep is a closed/airless system. i.e. the
> coolant should be even with the radiator cap when you take the cap off
> a cold radiator. The overflow bottle should have a low and high mark.
> With the engine cold the coolant should be about in the middle or just
> a bit below the high mark.
>
> What can happen is a crack in the overflow bottle or in the hose that
> runs to it. As you drive the expansion drives some coolant out and it
> dribbles down on the road. When the engine cools down air (rather
> than coolant) gets sucked back into the system.
>
> As air gets into the system this problem gets progressively worse.
>
> You check the overflow bottle by filling it up. and looking for leaks
> Generally what ever is remaining indicates where the crack is. The
> hose is just a matter of looking.
>
>
> --
> DougW

 

Just checked the coolant bottle and hose. There are no visible leaks.
I took them off, filled with water, pluged the hose and upper outlet
and blew in the top. Nothing came out.

Any other ideas? I'm looking for all options before I take the head
off.



bbb wrote:
> Thanks for the great ideas. The coolant is not bubbling like the
> picture. It is more like a burp.
>
> I will double check the over flow bottle and hose. I can go through a
> liter of coolant in around 1.5 weeks.
>
> There definately are no visible leaks on the over flow...what I mean is
> nothing is leaking on the ground.
>
>
> DougW wrote:
> > loren.betts@gmail.com did pass the time by typing:
> > > Hi All,
> > >
> > > Here's a good one. Bought used Jeep 2000 wrangler with 4L. Over the
> > > past few years replaced radiator, thermostat, water pump. Now I have a
> > > mysterious coolant loss. No visible leaks. Did compression test (not
> > > leak down). All cyclinders are 185 +- 10 psi.
> > >
> > > What I noticed is that if I take the rad cap off and start the
> > > engine...as it warms up the coolant starts to rise out of the top.
> > > When I rev up the motor the coolant goes down and does not over flow.
> > > However if I then release the throttle the coolant rises and over
> > > flows. I then watched more closely at it looks like there are bubbles
> > > that come up ver so often.
> > >
> > > This to me is pointing to a bad head gasket or head.
> >
> >
> > Gonna give you another thing to look at. Especially if you
> > don't have water in the oil or a grey cloud following you,
> > I'd suspect a leak in the overflow system.
> >
> > The coolant system in your jeep is a closed/airless system. i.e. the
> > coolant should be even with the radiator cap when you take the cap off
> > a cold radiator. The overflow bottle should have a low and high mark.
> > With the engine cold the coolant should be about in the middle or just
> > a bit below the high mark.
> >
> > What can happen is a crack in the overflow bottle or in the hose that
> > runs to it. As you drive the expansion drives some coolant out and it
> > dribbles down on the road. When the engine cools down air (rather
> > than coolant) gets sucked back into the system.
> >
> > As air gets into the system this problem gets progressively worse.
> >
> > You check the overflow bottle by filling it up. and looking for leaks
> > Generally what ever is remaining indicates where the crack is. The
> > hose is just a matter of looking.
> >
> >
> > --
> > DougW

 

Just checked the coolant bottle and hose. There are no visible leaks.
I took them off, filled with water, pluged the hose and upper outlet
and blew in the top. Nothing came out.

Any other ideas? I'm looking for all options before I take the head
off.



bbb wrote:
> Thanks for the great ideas. The coolant is not bubbling like the
> picture. It is more like a burp.
>
> I will double check the over flow bottle and hose. I can go through a
> liter of coolant in around 1.5 weeks.
>
> There definately are no visible leaks on the over flow...what I mean is
> nothing is leaking on the ground.
>
>
> DougW wrote:
> > loren.betts@gmail.com did pass the time by typing:
> > > Hi All,
> > >
> > > Here's a good one. Bought used Jeep 2000 wrangler with 4L. Over the
> > > past few years replaced radiator, thermostat, water pump. Now I have a
> > > mysterious coolant loss. No visible leaks. Did compression test (not
> > > leak down). All cyclinders are 185 +- 10 psi.
> > >
> > > What I noticed is that if I take the rad cap off and start the
> > > engine...as it warms up the coolant starts to rise out of the top.
> > > When I rev up the motor the coolant goes down and does not over flow.
> > > However if I then release the throttle the coolant rises and over
> > > flows. I then watched more closely at it looks like there are bubbles
> > > that come up ver so often.
> > >
> > > This to me is pointing to a bad head gasket or head.
> >
> >
> > Gonna give you another thing to look at. Especially if you
> > don't have water in the oil or a grey cloud following you,
> > I'd suspect a leak in the overflow system.
> >
> > The coolant system in your jeep is a closed/airless system. i.e. the
> > coolant should be even with the radiator cap when you take the cap off
> > a cold radiator. The overflow bottle should have a low and high mark.
> > With the engine cold the coolant should be about in the middle or just
> > a bit below the high mark.
> >
> > What can happen is a crack in the overflow bottle or in the hose that
> > runs to it. As you drive the expansion drives some coolant out and it
> > dribbles down on the road. When the engine cools down air (rather
> > than coolant) gets sucked back into the system.
> >
> > As air gets into the system this problem gets progressively worse.
> >
> > You check the overflow bottle by filling it up. and looking for leaks
> > Generally what ever is remaining indicates where the crack is. The
> > hose is just a matter of looking.
> >
> >
> > --
> > DougW

 

Just checked the coolant bottle and hose. There are no visible leaks.
I took them off, filled with water, pluged the hose and upper outlet
and blew in the top. Nothing came out.

Any other ideas? I'm looking for all options before I take the head
off.



bbb wrote:
> Thanks for the great ideas. The coolant is not bubbling like the
> picture. It is more like a burp.
>
> I will double check the over flow bottle and hose. I can go through a
> liter of coolant in around 1.5 weeks.
>
> There definately are no visible leaks on the over flow...what I mean is
> nothing is leaking on the ground.
>
>
> DougW wrote:
> > loren.betts@gmail.com did pass the time by typing:
> > > Hi All,
> > >
> > > Here's a good one. Bought used Jeep 2000 wrangler with 4L. Over the
> > > past few years replaced radiator, thermostat, water pump. Now I have a
> > > mysterious coolant loss. No visible leaks. Did compression test (not
> > > leak down). All cyclinders are 185 +- 10 psi.
> > >
> > > What I noticed is that if I take the rad cap off and start the
> > > engine...as it warms up the coolant starts to rise out of the top.
> > > When I rev up the motor the coolant goes down and does not over flow.
> > > However if I then release the throttle the coolant rises and over
> > > flows. I then watched more closely at it looks like there are bubbles
> > > that come up ver so often.
> > >
> > > This to me is pointing to a bad head gasket or head.
> >
> >
> > Gonna give you another thing to look at. Especially if you
> > don't have water in the oil or a grey cloud following you,
> > I'd suspect a leak in the overflow system.
> >
> > The coolant system in your jeep is a closed/airless system. i.e. the
> > coolant should be even with the radiator cap when you take the cap off
> > a cold radiator. The overflow bottle should have a low and high mark.
> > With the engine cold the coolant should be about in the middle or just
> > a bit below the high mark.
> >
> > What can happen is a crack in the overflow bottle or in the hose that
> > runs to it. As you drive the expansion drives some coolant out and it
> > dribbles down on the road. When the engine cools down air (rather
> > than coolant) gets sucked back into the system.
> >
> > As air gets into the system this problem gets progressively worse.
> >
> > You check the overflow bottle by filling it up. and looking for leaks
> > Generally what ever is remaining indicates where the crack is. The
> > hose is just a matter of looking.
> >
> >
> > --
> > DougW

 

bbb did pass the time by typing:
> Just checked the coolant bottle and hose. There are no visible leaks.
> I took them off, filled with water, pluged the hose and upper outlet
> and blew in the top. Nothing came out.
>
> Any other ideas? I'm looking for all options before I take the head
> off.

Possibly a teeny leak in one of the hoses that's only spraying when
the system is under pressure?

--
DougW