Engine overheating?

2013 CHEVROLET IMPALA

150,000 MILES

DAVENOOB

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During the summer 110°+ A/C running parked no issues. Now no A/C car overheats parked or driving actually have to turn A/C on to engage auxiliary fan. This happened last year around this time when it's still 70's-80's windows down, but the car starts to go over normal mark. When I say overheat, I mean gauge goes 2 marks above normal. Is this something with the auxiliary fan not kicking on or some thermostat idk. Thanks.

Oct 26, 2023 at 4:31 PM

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This could be the gauge that is off, I would use an infrared temperature gun on the upper radiator hose to check the temperature. When fully hot it should be 210-220 degrees.

https://www.2carpros.com/articles/how-to-use-an-infrared-temperature-meter

Does the cooling system boil over? Also, do you have a check engine light on?

This guide may help as well:

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

I have also seen the low-speed fan relay go out and cause this as well so I would swap it out, here is the location and the cooling fan wiring diagrams to help. Check out the images (below). Please let us know what happens.

Images (Click to enlarge)

Oct 26, 2023 at 5:20 PM