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Overheat caution light?

Tiny
DEBBIENICKSIC
  • MEMBER
  • 2004 CHEVROLET IMPALA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 162,000 MILES
A few days ago, this car went from cool to hot in moments. No steam etc. I put more coolant into the car and the level is good. It has not gone to overheat levels since then, but the dial does flip back and forth to sometimes over the median mark. Does this sound like I have a thermostat that needs replacing?
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Thursday, July 2nd, 2009 AT 12:57 PM

1 Reply

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

If your engine actually does not overheat and the temperature gauge just fluctuates back and forth.
Then it is probably the coolant temperature sensor that is faulty. It is just producing wrong signal to the gauge.

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

https://youtu.be/GSE9skKnOgY

I have attached the temperature sender diagrams with replacement procedure.

Please let me know of any questions.

Thank you.
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Wednesday, August 4th, 2021 AT 2:31 PM

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