Question about 2008 Chevrolet Impala

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How do I fix an erratic outside temp gauge

I have a 2008 Impala, whose outside temp. gauge indicates a -40 degrees when it could be 80 degrees. I noticed on the internet that I am not the only person to have had this problem. I took it to the dealer, they changed the sensor, said they cleaned some corrosion, charged $125.00 and the problem still exists. I could not find a solution on the internet. I did notice that when there is excess moisture like rain, wet payment, and car wash the temp will drop to -40 degrees. What is the solution?

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  • Chevrolet Master
  • 1,243 Answers

You have a water intrusion problem. The first step is to locate where the water is coming into car. The water is apparently getting in the wiring harness.

Posted on Nov 10, 2014

Testimonial: "This problem occurs also when it's 90 degrees out and no rain for weeks. I can start the car and it indicates -40 degrees. I don't believe this is a solution."

  • Adam Scott Roberts Nov 10, 2014

    If the dealer stated that corrosion was present then it does not matter if it is dry or wet. The harness may be corroded internally and creates resistance on that circuit.

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4 Suggested Answers

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Posted on Jan 02, 2017

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monkeybear45
  • 94 Answers

SOURCE: I notice the my temp gauge fluctuates sometimes up

If I were you I would replace the thermostat. It's cheaper and usually takes less than an hour to change. Before you install the new one, put it in a pot of water and heat it up using a bakers thermometer to check and make sure it opens at the right temperature. I've had bad t-stats right out of the box. Maybe I just have bad luck!

Posted on Nov 29, 2009

elix0411
  • 3530 Answers

SOURCE: I own a 2000 Chevy

Welcome to Fixya

Check the physical wiring of the radiator Fan. there might be loose wiring. I suggest you direct the wiring to the ignition switch. So that when you turn the key to ON position the fan will engage right away. Overheating engine might damage serious parts inside the engine.

Thank you for usig Fixya!

Posted on Jul 18, 2011

skychief2001
  • 21873 Answers

SOURCE: ambient temp sensor on chevy impala is reading -40

If you replaced the right sensor, there must be a problem in the wiring to the computer.
You did reset the computer - hit ac and recirculate buttons at the same time ??

Posted on Jul 28, 2012

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