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

 

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

 

DougW wrote:
>
> 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

I had one like that too. I was losing coolant but could never figure
out where until I noticed my battery was 'wet' one day. It was a
pinhole in a core that finally got big enough to make it to the battery
on the firewall. Before that it was just spraying on the ground under
acceleration when the pressure was highest.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

 

DougW wrote:
>
> 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

I had one like that too. I was losing coolant but could never figure
out where until I noticed my battery was 'wet' one day. It was a
pinhole in a core that finally got big enough to make it to the battery
on the firewall. Before that it was just spraying on the ground under
acceleration when the pressure was highest.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

 

DougW wrote:
>
> 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

I had one like that too. I was losing coolant but could never figure
out where until I noticed my battery was 'wet' one day. It was a
pinhole in a core that finally got big enough to make it to the battery
on the firewall. Before that it was just spraying on the ground under
acceleration when the pressure was highest.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

 

"Mike Romain" <romainm@sympatico.ca> wrote in message
news:44A6FC15.3B0B02F0@sympatico.ca...
> DougW wrote:
>>
>> 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
>
> I had one like that too. I was losing coolant but could never figure
> out where until I noticed my battery was 'wet' one day. It was a
> pinhole in a core that finally got big enough to make it to the battery
> on the firewall. Before that it was just spraying on the ground under
> acceleration when the pressure was highest.
>
> Mike

I had one too on a Chevy truck. Got so frustrating that I took it to my
buddies shop where he specializes in cooling systems and AC. The thing would
hold pressure with a pressure tester, and he even put the UV dye in the
coolant, but still nothing. Only after letting it run for about 2 hours did
it start to leak. It sprayed a stream about the same size as a piece of
thread from the upper hose.

Chris

 

"Mike Romain" <romainm@sympatico.ca> wrote in message
news:44A6FC15.3B0B02F0@sympatico.ca...
> DougW wrote:
>>
>> 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
>
> I had one like that too. I was losing coolant but could never figure
> out where until I noticed my battery was 'wet' one day. It was a
> pinhole in a core that finally got big enough to make it to the battery
> on the firewall. Before that it was just spraying on the ground under
> acceleration when the pressure was highest.
>
> Mike

I had one too on a Chevy truck. Got so frustrating that I took it to my
buddies shop where he specializes in cooling systems and AC. The thing would
hold pressure with a pressure tester, and he even put the UV dye in the
coolant, but still nothing. Only after letting it run for about 2 hours did
it start to leak. It sprayed a stream about the same size as a piece of
thread from the upper hose.

Chris

 

"Mike Romain" <romainm@sympatico.ca> wrote in message
news:44A6FC15.3B0B02F0@sympatico.ca...
> DougW wrote:
>>
>> 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
>
> I had one like that too. I was losing coolant but could never figure
> out where until I noticed my battery was 'wet' one day. It was a
> pinhole in a core that finally got big enough to make it to the battery
> on the firewall. Before that it was just spraying on the ground under
> acceleration when the pressure was highest.
>
> Mike

I had one too on a Chevy truck. Got so frustrating that I took it to my
buddies shop where he specializes in cooling systems and AC. The thing would
hold pressure with a pressure tester, and he even put the UV dye in the
coolant, but still nothing. Only after letting it run for about 2 hours did
it start to leak. It sprayed a stream about the same size as a piece of
thread from the upper hose.

Chris

 

I had a similar situation on my 02 tj. 4L. I never noticed the bubbling in
the coolant, but I also never checked because mine occurred at 20k miles and
I brought it back to the dealer.

Like you, I did not see any leaks, no bubbles in the oil, no smoke; nothing
typical of a bad headgasket or cracked head. I think I was losing coolant at
a similar rate that you are.(that was 2 years ago, I cant quite recall the
exact loss rate.)

I don't want to ruin your day, but mine was a cracked head.

I hope yours turns out to be a gasket or something ridiculous.

John
<loren.betts@gmail.com> wrote in message
news:1151784870.798465.269050@v61g2000cwv.googlegr oups.com...
> 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.
>
> What are your thoughts? Any other things to try before I pull the head
> off and spend the $250 for all the gaskets?
>
> Help!
>
> Loren
>

 

I had a similar situation on my 02 tj. 4L. I never noticed the bubbling in
the coolant, but I also never checked because mine occurred at 20k miles and
I brought it back to the dealer.

Like you, I did not see any leaks, no bubbles in the oil, no smoke; nothing
typical of a bad headgasket or cracked head. I think I was losing coolant at
a similar rate that you are.(that was 2 years ago, I cant quite recall the
exact loss rate.)

I don't want to ruin your day, but mine was a cracked head.

I hope yours turns out to be a gasket or something ridiculous.

John
<loren.betts@gmail.com> wrote in message
news:1151784870.798465.269050@v61g2000cwv.googlegr oups.com...
> 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.
>
> What are your thoughts? Any other things to try before I pull the head
> off and spend the $250 for all the gaskets?
>
> Help!
>
> Loren
>