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HHR 2.2L LT Overheating issue - Please help??


New member
Sep 4, 2017
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I have a 2.2L HHR that is giving me issues and I am at my wits end as to what to do next.

The temp after about 15 minutes of driving creeps up to over 230 -245 and eventually goes into cooling mode until I turn it off and let it cool down When I am stopped I can hear the coolant boiling in the overfill bottle.

The car runs absolutely great ac works fine but will overheat every time. I never allow it to get to the red zone because I only use it for very short trips but if allowed it would definitely go there.

So far I have replaced the water pump, radiator, thermostat and temp sending unit. I compression tested the engine to see if there was a problem and that seemed to come back fine ( see attached photo ) Cyl 1 - 4 were 170,160,170 and 165 respectively.

I also did a cooling system pressure test and it held fine at 15 lbs for 20 minutes.

I will attempt to upload the short video of the overfill tank boiling over.


I've run out of point to check from here
BTW just started throwing 2 new codes which I think are unrelated;
P0102: Mass or Volume Air Flow Circuit Low Input
P0113: Intake Air Temperature Circuit High Input

Any help would be greatly appreciated


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Staff member
Apr 24, 2012
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when the engine is running at the high temperatures of 230 to 245 is the engine fan running?
if you turn on the AC with a cold engine, does the engine fan come on?
your link does not work but seeing the tank boil over does not aide in diagnosing the problem.