Hey so my 1997 grand prix 3.8 v6 has been having a weird issue. When it starts up its cold then slowly go to 160 then too 195 then back to 180 and when I'm driving it'll stay under 160. What's going o

10

Asked by Apr 07, 2015 at 04:20 PM about the 1997 Pontiac Grand Prix 4 Dr SE Sedan

Question type: Maintenance & Repair

3 Answers

7,665

That's a thermostat issue, replace it.

1 of 1 people found this helpful.
10

Awesome. I replaced it 5 minutes ago and am about to go test it. Wish me luck

1 of 1 people found this helpful.
4,175

A certain amount of temperature fluctuation is normal under certain driving conditions. A new thermostat every now and again is a good idea anyway though. As long as it doesn't actually overheat or run cold all the time you'll be fine.

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