Question about 2002 Jeep Liberty

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Jeep Liberty Boils Over Into Resevior

My jeep liberty boils over. At idle it will not overheat or boil, but when revved up it will boil after about 30 seconds. The boil over will not be as quick or severe when the heater is on, but it does eventually boil even with the heater on. I have replaced the thermostat, water pump, have it full of coolant, have attempted to remove all of the air, but how does one know that all the air is out? I have not checked the pressure with a compressor for cracks/leaks. So perhaps that is the next move. I am concerned that the radiator does not flow as well as it should and that may be a factor. I flushed it and it is not clogged, but maybe does not flow as well as it should. I think the main thing to consider is that at idle it all works fine. The jeep can idle for an hour and not over heat/boil. When revved up it will boil into the plastic tank through the overflow line coming off the top of the radiator. No water in oil, no smoke, just seems to boil very quickly. Thanks for reading, any help is appreciated. If you have any questions I will answer them asap. Would love to get this maddness over quickly.

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Hi there,
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Posted on Jan 02, 2017

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SOURCE: 1999 jeep gran cherokee is pushing water into

do you have a hose that is collasping on you, please check them.

Posted on Feb 17, 2011

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SOURCE: My 3.7 liter 6 V Jeep Liberty (2003) runs hot very

Chek in this order:

1- The water level in the auxiliary deposit.
2- the ventilator, some one have in the center a viscosity licuit that become hard when the temperature increase, if not, the air flow slowly and the water increase the temperature.
3- the valve, this is locate in the return tube from the radiator to the motor, this one regulate the pass of water to maintain the temperature stable.

I hope this help you.

Posted on Nov 03, 2011

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1 Answer

How to check thermostat on a 2012 jeep liberty 3.7L V6 engine?

Hello Ron Roney,

Pretty simple...

The thermostat is about $10 to $15 USD
2012 JEEP LIBERTY 3 7L V6 Thermostat Housing Water Outlet RockAuto

If you are seriously INTERESTED in ONLY TESTING a
thermostat... MY BEST RECOMMENDATION... Buy
a new one (preferably a OEM Stock one you can
use (when your are done playing))...

Boil a pot of water... remove from heat...

DROP IN the NEW thermostat...

By the time (if you are fast) ... you see it open the water
Will be just ABOVE 195 degrees Fahrenheit...
It should immediately open...

Drop in ONE or TWO ice-cubes per cup
of water should be enough to cause the
water to drop BELOW 180 Degrees Fahrenheit
the THERMOSTAT to close.


This way you avoid greasy fingers, anti-seize
gasket and LIKELY HOUSING costs...
More Information for MOPAR 53020887AD

Gasket (seal)
2012 JEEP LIBERTY 3 7L V6 Thermostat Thermostat Housing Water Outlet Seal...

Hope this helps

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2 Answers

Overheating coolant boiling out into reserve tank

you have a blown head gasket.. doesn't have to have coolant in the oil for a blown head gasket... if hoses are rock hard when running then you have exhaust leaking into the coolant via a blown head gasket...

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2004 Jeep Liberty. Cannot sit and idle. Overheats, smokes, anti-freeze boils. Had thermostat replaced. I was told that I need a new fan module. What's the diff. between the fan and a fan module??? The...

Check on eBay, you can find them modules on there for a LOT less than at parts stores! Of course it may take about a week or so to get it!
Once you get it, you may can replace it yourself? Try looking up a video on youtube or of course once you have it you may can identify it yourself under the hood of the vehicle and replace it.
Most just plug right in, but I can't recall right off on that model. Trust me, google can be your friend. :)

Dec 23, 2017 | 2004 Jeep Liberty

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I keep geting a low coolant indicator when it first starts in the morningalso it keeps overflowing and boiling our of the overflow tank. This happens even when ythe coolant level is below full.

Either the thermostat is stuck in the closed position...or the engine cooling system cannot pressurize...both will cause an overheat condition.
A blown head gasket can cause overheat condition as well as fluid loss (boil over)

I'd maybe remove the thermostat and either just replace it or not have a thermostat installed just to see if it still boils over. If it boils over with no thermostat installed then you're getting into possible leak in cooling system...i.e. water pump weep hole, hose or radiator leak...or a blown head gasket.

Hope this helps...

Aug 28, 2011 | 1995 Jeep Grand Cherokee

1 Answer

My 2005 jeep liberty overheats at an idle but not all the time the front did get packed with snow in the lower part of the grill but i looked for leaks and damage but found none

If it overheats at idle only, then there is a problem with the fan. Check out this article, to know for sure. There are some good instructions to follow. They will tell why your truck overheats.

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1 Answer

Jeep Liberty 2005 3.7 engine running hot, need to install thermostat? fan working, full of water , water tank cap fits good.

A new thermostat would be the easiest and cheapest to do first.There is also the water pump but that normally would cause a complete overheat,probably after about 20-30 miles,water boiling out the overflow.Good luck! Greg

Sep 05, 2010 | 2005 Jeep Liberty

1 Answer

Runs hot 205-210 I live in the desert. It boils over sometimes.

Should not overheat at 210 I don't live in the desert and mine runs at that temp all the time! You need to run a 50/50 antifreeze water mix (verify with a tester) It may also help to use distilled water. Mineral content can lower boil point a bit.That should raise the boil point up to about 225. Also make sure the cap is the correct pressure rating (think it's 18psi) and that it is sealing properly.

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1 Answer

Car overheated and antifreze was boiling and spewing over until engine cooled. 2004 jeep liberty 2wd. Thanks!

Need to know what caused the overheating, possible broken serpentine belt, thermostat, water pump, radiator, fan clutch, cooling fan motor. After motor has cooled down fill radiator with water till full, look make sure serpentine belt not broke, start engine run about 5 minutes, turn off, let sit 3 minutes, start engine look at temperture gauge is it over half way of gauge, Do you have a fan blade driven by water pump or electric fans?

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1 Answer

02 Jeep Liberty check engine light and trans. revving


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