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Cooling System or head gasket.
http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=1&t=87404		 Page 1 of 1
Author:  chrstphrbuf1 [ Thu Nov 09, 2017 8:20 pm ]
Post subject:  Cooling System or head gasket.
I have a 2006 Jeep Liberty. It ran hot on my wife to the point that it died. The radiator was busted. I replaced the radiator, thermostat, water pump and radiator cap. I drive 37 miles to work. Once I get to work and turn the jeep off it bubbles back into the reservoir and overflows. (During the trips to and from work the jeep never runs hot) I suspected a blown head gasket. There is no sweet smell to the exhaust or smoke. The oil is perfect. I conducted a block test and the test showed no exhaust gasses in the coolant. What could be causing the blowback in the reservoir?
Author:  WWDiesel [ Thu Nov 09, 2017 8:52 pm ]
Post subject:  Re: Cooling System or head gasket.
chrstphrbuf1 wrote:
I have a 2006 Jeep Liberty. It ran hot on my wife to the point that it died. The radiator was busted. I replaced the radiator, thermostat, water pump and radiator cap. I drive 37 miles to work. Once I get to work and turn the jeep off it bubbles back into the reservoir and overflows. (During the trips to and from work the jeep never runs hot) I suspected a blown head gasket. There is no sweet smell to the exhaust or smoke. The oil is perfect. I conducted a block test and the test showed no exhaust gasses in the coolant. What could be causing the blowback in the reservoir?

Bubbles in the reservoir is a sure sign of compression being pumped into the coolant system! :cry:

Most likely a leaking head gasket or worse yet a cracked head! :grim:
Some on LOST have stated that the test for exhaust gas in coolant has not been all inclusive.... :roll:

One test is to pull either the injectors or the glow plugs, let vehicle set overnight, spin engine over after setting all night and see if any coolant comes out whichever hole you opened up!
This will not tell you which is the culprit, gasket or cracked head. Only sure fire way is to pull head and have it pressure tested! If it tests good, then, have the head milled if warped, replace the head gasket, and install ARP studs...

Best of luck,
need help, just ask, lots of very good experienced advice available on this forum! :wink:
Author:  tjkj2002 [ Thu Nov 09, 2017 9:59 pm ]
Post subject:  Re: Cooling System or head gasket.
WWDiesel wrote:
One test is to pull either the injectors or the glow plugs, let vehicle set overnight, spin engine over after setting all night and see if any coolant comes out whichever hole you opened up!
This will not tell you which is the culprit, gasket or cracked head. Only sure fire way is to pull head and have it pressure tested! If it tests good, then, have the head milled if warped, replace the head gasket, and install ARP studs...

Best of luck,
need help, just ask, lots of very good experienced advice available on this forum! :wink:

You pull the spark plugs on a gas engine since the injectors are not located in the combustion chamber.

Never mill a alloy head if warped,the 1st head cycle it's warped again.

Can't use studs on the 3.7 either.


To OP most common is a blown head gasket but might as well plan on replacing both heads since that bad of a over heat will cause a dropped valve seat down the road.
Author:  WWDiesel [ Thu Nov 09, 2017 10:22 pm ]
Post subject:  Re: Cooling System or head gasket.
tjkj2002 wrote:
WWDiesel wrote:
One test is to pull either the injectors or the glow plugs, let vehicle set overnight, spin engine over after setting all night and see if any coolant comes out whichever hole you opened up!
This will not tell you which is the culprit, gasket or cracked head. Only sure fire way is to pull head and have it pressure tested! If it tests good, then, have the head milled if warped, replace the head gasket, and install ARP studs...
Best of luck,
need help, just ask, lots of very good experienced advice available on this forum! :wink:

You pull the spark plugs on a gas engine since the injectors are not located in the combustion chamber.
Never mill a alloy head if warped,the 1st head cycle it's warped again.
Can't use studs on the 3.7 either.
To OP most common is a blown head gasket but might as well plan on replacing both heads since that bad of a over heat will cause a dropped valve seat down the road.

Did he say it was a gasser? Did I miss that?
Author:  tjkj2002 [ Thu Nov 09, 2017 10:38 pm ]
Post subject:  Re: Cooling System or head gasket.
WWDiesel wrote:
tjkj2002 wrote:
WWDiesel wrote:
One test is to pull either the injectors or the glow plugs, let vehicle set overnight, spin engine over after setting all night and see if any coolant comes out whichever hole you opened up!
This will not tell you which is the culprit, gasket or cracked head. Only sure fire way is to pull head and have it pressure tested! If it tests good, then, have the head milled if warped, replace the head gasket, and install ARP studs...
Best of luck,
need help, just ask, lots of very good experienced advice available on this forum! :wink:

You pull the spark plugs on a gas engine since the injectors are not located in the combustion chamber.
Never mill a alloy head if warped,the 1st head cycle it's warped again.
Can't use studs on the 3.7 either.
To OP most common is a blown head gasket but might as well plan on replacing both heads since that bad of a over heat will cause a dropped valve seat down the road.

Did he say it was a gasser? Did I miss that?

He never mentioned the insane cost of the t-stat or a timing belt,best bet is it's a 3.7.
Author:  GordnadoCRD [ Fri Nov 10, 2017 4:20 am ]
Post subject:  Re: Cooling System or head gasket.
Either way, If you have any air pockets trapped in the head(s) the hot spots quickly become REALLY hot spots, and air is an insulator. Once that happens, fluid that tries to come in contact instantly turns to gas and the air pocksts get bigger. When you shut down and things start to normalize again, those hot spots boil out any fluid that comes in contact again, and will force fluid out the cap to the overflow. I don't know if the 3.7L has any problem areas that need special bleeding, so please pardon my ignorance there, I just mention it as a scenario that can happen.
Author:  tjkj2002 [ Fri Nov 10, 2017 7:50 am ]
Post subject:  Re: Cooling System or head gasket.
GordnadoCRD wrote:
Either way, If you have any air pockets trapped in the head(s) the hot spots quickly become REALLY hot spots, and air is an insulator. Once that happens, fluid that tries to come in contact instantly turns to gas and the air pocksts get bigger. When you shut down and things start to normalize again, those hot spots boil out any fluid that comes in contact again, and will force fluid out the cap to the overflow. I don't know if the 3.7L has any problem areas that need special bleeding, so please pardon my ignorance there, I just mention it as a scenario that can happen.

Yes the 3.7 has a special bleeding procedure,must fill the engine 1st through the bleed hole on the upper radiator hose since the t-stat is located on the bottom of the engine.
Author:  mass-hole [ Sat Nov 11, 2017 9:34 pm ]
Post subject:  Re: Cooling System or head gasket.
tjkj2002 wrote:
WWDiesel wrote:
tjkj2002 wrote:
[quote="WWDiesel"]
One test is to pull either the injectors or the glow plugs, let vehicle set overnight, spin engine over after setting all night and see if any coolant comes out whichever hole you opened up!
This will not tell you which is the culprit, gasket or cracked head. Only sure fire way is to pull head and have it pressure tested! If it tests good, then, have the head milled if warped, replace the head gasket, and install ARP studs...
Best of luck,
need help, just ask, lots of very good experienced advice available on this forum! :wink:

You pull the spark plugs on a gas engine since the injectors are not located in the combustion chamber.
Never mill a alloy head if warped,the 1st head cycle it's warped again.
Can't use studs on the 3.7 either.
To OP most common is a blown head gasket but might as well plan on replacing both heads since that bad of a over heat will cause a dropped valve seat down the road.

Did he say it was a gasser? Did I miss that?

He never mentioned the insane cost of the t-stat or a timing belt,best bet is it's a 3.7.[/quote]

Lol.


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