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Temp gauge reads cold

Tiny
ANONYMOUS
  • MEMBER
  • 2010 CHEVROLET MALIBU
Coolant temp gauge reads cold after driving for awhile. The car runs fine, no problems but no reading on the gauge. Is this the thermostat or a coolant sensor problem?
Thursday, March 14th, 2013 AT 7:15 PM

7 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Hello,

It sounds like the thermostat is stuck open here is a guide to help walk you through the steps of changing it with diagrams below to show you how on your car. If the thermostat is okay replace the coolant temperature sensor I have included location and instructions for both engines that come in this car.

https://www.2carpros.com/articles/replace-thermostat

and this will walk your through the steps with diagrams below for your car.

https://www.2carpros.com/articles/coolant-temperature-sensor-cts-replacement

Check out the diagrams (Below). Please let us know what you find. We are interested to see what it is.
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Thursday, March 14th, 2013 AT 8:03 PM
Tiny
OIDAVEY
  • MEMBER
  • 0 POST
I had to replace the coolant sensor thanks! Cost me $43.00. Good as new
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Wednesday, January 30th, 2019 AT 1:57 PM
Tiny
AL-MOJREMVAAN
  • MEMBER
  • 3 POSTS
  • 2010 CHEVROLET MALIBU
  • 36,000 MILES
I was driving at 1:30 pm and the A/C was on and was a lil cold. Suddenly I felt hot air coming out from the A/C and the gauge dropped to the lowest point immediately. This is the first time this happens to me. What might cause such a thing? And is it dangerous to drive like that?
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Wednesday, January 30th, 2019 AT 1:58 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
No it's not dangerous, you may have had a accumalator fail or move during driving. If the ac still blows hot then have it checked as you could have blown a line or something similar.
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Wednesday, January 30th, 2019 AT 1:58 PM (Merged)
Tiny
AL-MOJREMVAAN
  • MEMBER
  • 3 POSTS
Thanx hmac300 for the quick answer. I trie to start my car just an hour ago and the gauge was low.I turned the A/c on and it blows hot air.I kept it on for like 5 minutes and I heard a sound ( the one you hear when A/C starts working). And air was cold and the gauge moved up slowly to normal position. And now I started the car again to see if the problem is gone. But the gauge dropped again and started going up very slowly to normal. It's crazy.
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Wednesday, January 30th, 2019 AT 1:58 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
It does this because the computer thinks the engine is overheating which you can check to see if it is or not, it could be a bad engine coolant temperature sensor.
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Wednesday, January 30th, 2019 AT 1:58 PM (Merged)
Tiny
AL-MOJREMVAAN
  • MEMBER
  • 3 POSTS
The gauge is working when I start the car. And when the system done checking it goes down. Maybe the sending unit. Thank you so much and ill go to the dealership tom.
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Wednesday, January 30th, 2019 AT 1:58 PM (Merged)

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