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False overheating warning light turning on?

Tiny
JYOUNG37766
  • MEMBER
  • 2002 CHEVROLET IMPALA
  • 6 CYL
  • AUTOMATIC
  • 100,000 MILES
The warning light is coming on saying that it is overheating, however it is cool to the touch and there is no steam or anything of that nature. I just replaced the thermostat and the spark plugs.
Saturday, September 3rd, 2022 AT 1:01 PM

3 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 43,045 POSTS
Yep, it sounds like the engine coolant temperature sensor is stuck at the upper range. Here is the coolant sensor location so you can sway it out, let me know how things go. Check out the diagrams (below). Please let us know what you find. I left location for both the 3.6 and 3.4.
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Saturday, September 3rd, 2022 AT 4:19 PM
Tiny
JYOUNG37766
  • MEMBER
  • 2 POSTS
We replaced the ECT tonight and at first it was doing good so I drove it to the gas station and for some reason it did it again.
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Saturday, September 3rd, 2022 AT 11:47 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 43,045 POSTS
You could have a defective thermostat, which brand did you use? I always use OEM parts, FYI. To confirm, remove the thermostat and drop it in a pan of boiling water to see if it opens.
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Monday, September 5th, 2022 AT 9:15 AM

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