Temperature fluctuating

2007 PONTIAC GRAND PRIX

186,000 MILES • 3.8L • 6 CYL • TURBO • 2WD • AUTOMATIC

SBENNETT6585

MEMBER
12 POSTS
FOLLOW

I have the car listed above supercharged. Lately the temperature gauge has been fluctuating from about three quarters all the way down to almost all the way low. The other day after driving on the highway for thirty minutes when we took the exit and come into town at the stoplight the temperature was reading all the way at the low position and the heater was barely warm. I am stumped. Please help. thank you.

Mar 4, 2019 at 8:22 PM

Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.

SCGRANTURISMO

AUTOMOTIVE REPAIR CONTRIBUTOR
4,897 POSTS

Hello,

This could be a problem with your thermostat sticking. Usually when a thermostat exhibits symptoms like these, it's best to replace it. They're inexpensive and if it decides to stick closed and you don't catch it, you could overheat your engine and do major damage to it. I have included a few links below for you to check out.

https://www.2carpros.com/articles/how-an-engine-thermostat-works
https://www.2carpros.com/articles/replace-thermostat

I have also included directions on how to replace your vehicle's specific thermostat in the diagrams below.

Thanks,
Alex
2CarPros

Images (Click to enlarge)

Mar 5, 2019 at 1:21 AM