Fluctuating temp gauge

Asked by GuruD4G1G Aug 04, 2017 at 01:06 AM about the 2008 GMC Yukon Denali AWD

Question type: Maintenance & Repair

I have a 2008 Denali and my temp gauge
just started going from like 170 to 210
backs to 170 and the back to 210 in a
matter of seconds! It never runs hot but up
down up down! Any ideas why or what's
wrong?

7 Answers

58,955

Other than checking for air in the system or bad fans, relays, low coolant level basically all the normal items and the thermostat. I would say bad head gasket. Do a compression check on all cylinders and/or test for exhaust in coolant if all the cooling system checks out.

1 people found this helpful.
157,115

You might try replacing the coolant temperature sender and thermostat to make certain they are not the problem.

1 people found this helpful.
140

Dose it do it when you turn a corner or come to a stop?

7 people found this helpful.
30

coolant temperature sender need to replace ,,,, as usual ... drama

2 people found this helpful.
140

Has nothing to do with gage thermast .It's in the wiring. Look on the passenger side of the truck.You will see the bundle of wires pinned to the fire wall around a line from the air conditioning. Pull the wires from the fire wall. Separate the wires . I have not had a bit of trouble since. By the way if you can get your local Chevy dealer to admit it, it's a problem they have known about for some time.

7 people found this helpful.
10

Would that bundle of wires Cause other electrical problems

1 people found this helpful.
30

The temperature gauge drop and make you about take off and get up speed it go back 210..

3 people found this helpful.

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