Temperature gauge not working properly

Tiny
FRANCODADI
  • MEMBER
  • 2013 CHEVROLET MALIBU
  • 2.4L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 250,000 MILES
Overheat alerts on dash display with temperature pinned to the hot side of the gauge. I had just started the car. Not even warm yet. The fan is in full blast mode coolant in the tank and circulating, no leaks, the belt is fair and no noise from the water pump. After shutting off and cooling down for 25 minutes the temperature is back to normal. After I drove for a few minutes, the temperature gauge rose quickly and bounced between norm and hot. This is weird, never had this happen before. The hoses are warm to the touch.
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Monday, May 9th, 2022 AT 7:03 PM

3 Replies

Tiny
SEAN M
  • EXPERT
Hello,

It sounds like you might have a faulty coolant temperature sensor.
The temperature sensor sends signal to the gauge and also controls the cooling fan. As it is showing 'hot' it is triggering the fan to cool down the engine.

Here are some helpful guides:

https://www.2carpros.com/articles/how-a-coolant-temperature-sensor-works
https://www.2carpros.com/articles/symptoms-of-a-bad-coolant-temperature-sensor
https://www.2carpros.com/articles/coolant-temperature-sensor-cts-replacement

I have attached a diagram for your reference.

Let me know of any questions.
Thank you.
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Monday, May 9th, 2022 AT 10:22 PM
Tiny
FRANCODADI
  • MEMBER
How many temperature sensors are there, and which one should I change? I feel I should change the right-angle engine temperature sensor at the rear of the engine.
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Tuesday, May 10th, 2022 AT 12:20 AM
Tiny
SEAN M
  • EXPERT
It is rear of the engine, close to the starter. Please refer to the diagram above.
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Tuesday, May 10th, 2022 AT 6:57 AM

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