Intermittent overheating issue I changed the thermostat and coolant temperature sensor

2007 CHEVROLET EQUINOX
205,000 MILES • 0.5L • AUTOMATIC
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ZMAN6677
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I’ve been having problems for months now with it. I changed the thermostat and coolant temperature sensor. some days I can drive and it’ll be fine going for hours then the next I can drive for 5 minutes and it’ll go all the way up on the temperature gauge any ideas?
Apr 23, 2020 at 4:41 PM
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ASEMASTER6371
  • ✓Experienced Mechanic
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Good morning,

There are many possibilities for this but since this has been happening often, you may have damaged the head gasket from constant overheating.

https://www.2carpros.com/articles/engine-overheating-or-running-hot

I would have a leak down test done on all the cylinders to determine is the head gasket is leaking into the cooling system. This is a test where they remove the plugs and insert shop air into each cylinder and look for movement in the radiator.

https://www.2carpros.com/articles/symptoms-of-an-overheating-engine

https://www.2carpros.com/articles/head-gasket-blown-test

A clogged radiator will also cause the overheating and the temperatures of the radiator need to be tested to verify as that may be the root cause of overheating and the reason for the head gasket failure.

Roy
Jul 1, 2021 at 6:05 AM
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ZMAN6677
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I bled the air out through the bleeder screw and it did fine after that for weeks and now it’s acting up again. is there anyway air could be getting trapped in the system some how?
Jul 1, 2021 at 6:05 AM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
Yes, from the failed head gasket. That is why you need to have it tested.

Roy
Jul 1, 2021 at 6:05 AM
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