Engine overheating?

2013 CHEVROLET IMPALA
150,000 MILES
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DAVENOOB
  • MEMBER
  • 371 POSTS
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 9:31 AM
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STRAILER
  • ✓Experienced Mechanic
  • 55,612 POSTS
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.
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Oct 26, 2023 at 10:20 AM
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