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Halfpint 8/7/2019

2004 Jeep Liberty Sport 6 Cyl 3.70L


Jeep Liberty overheating. Forum will not let me enter 6 cylinder 3.7 L)

Just replaced radiator, thermostat, coolant Reservoir cap and water pump. Flushed, bled system of air correctly, still overheating. Electric fan, heater, and AC all work. No coolant smell, leaks or visible steam. Does not overheat at idle only after driving about 15 minutes, overheats even faster going uphill. Although engine shows no signs of overheat. Got a new coolant temperature sensor about a year ago, pulled it out and it looks fine. I don't know what's left to do. Maybe the Reservoir cap I got is not fitting properly? I am just at a complete loss of what's left to diagnose. Any input would be much appreciated, 2004 Jeep Liberty 3.7 L . thanks!

1 Answer


Jimm 8/7/2019

Loss of coolant because of a coolant leak is probably the most common cause of engine overheating. Possible leak points include hoses, the radiator, heater core, water pump, thermostat housing, head gasket, freeze plugs, automatic transmission oil cooler, cylinder head(s) and block.

Make a careful visual inspection of the entire cooling system, and then PRESSURE TEST the cooling system and radiator cap. A pressure test will reveal internal leaks such as seepage past the head gasket as well as cracks in the head or block. A good system should hold 12 to 15 psi for 15 minutes or more with no loss in pressure. If it leaks pressure, there is an internal coolant leak (most likely a bad head gasket but possibly also a cracked cylinder or engine block).

It is important to pressure test the radiator cap, too, because a weak cap (or one with too low a pressure rating.

1. Perform a cooling system / radiator pressure test when the engine is cold - as a first step to locate the leak.
Obtain a loaner tool / free radiator pressure tester from the local auto parts stores such as Autozone, O'Reilly, NAPA, Advance Auto, or PepBoys. Follow their instructions and pump it to an adequate air pressure 12 -15 psi or the pressure rating listed on the radiator or reservoir cap. Observe the leaks and perform the repair.
Note: do not over pressurize beyond the pressure allowed by the radiator cap, then test the radiator cap as well.

2. Air pockets trapped in the cooling system can cause the engine to overheat. Some cooling systems have air bleed valves built into the system to aid in the removal of air pockets. Advice: For many cooling systems, the method of removing air pockets is to start the engine and allow it to run with the radiator cap off or loose until all the air escapes from the neck of the radiator. For some systems this method is not sufficient, and the manufacturer has installed air bleed valves usually near or on the thermostat housing.


Halfpint 8/7/2019

Thank you so much and yeah it's scary because the gasket is the last thing I have not checked, I guess I'll read the pressure kit from the auto parts store. Definitely no coolant loss. And I definitely bled all the air out of the system eating using a homemade perch type tool to force the air out. Once again thank you so much I'll cross my fingers.


Halfpint 8/7/2019

Please excuse typos, voice to text.

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