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Engine overheating?

Tiny
DAVENOOB
  • MEMBER
  • 2013 CHEVROLET IMPALA
  • 150,000 MILES
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.
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Thursday, October 26th, 2023 AT 4:31 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,410 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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Thursday, October 26th, 2023 AT 5:20 PM

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