Grand prix heat off and on also, drinking coolant?
20

Asked by usmc1995 Jan 21, 2016 at 09:55 PM about the 2002 Pontiac Grand Prix SE

Question type: Maintenance & Repair

02 grand prix 250k miles. Really weird situation here, what it does is the
gauge will act normally and produce heat normally. All of a sudden it flies
up and down slowly almost overheats but doesnt. Then the gauge will
come back down all the while me having absolutely no heat. What ive done
before is add coolant (dexcool) And it will stop, it will produce heat, and act
normally for about two weeks. Now ive noticed no physical spiils on the
ground and the oil isnt milky. It needs changed but isnt milky. any ideas???
im at a loss here...

2 Answers

F_O_R answered 8 years ago

Wildly fluctuating coolant temperatures would indicate to me that you have a bad thermostat.

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Wisco87 answered 5 years ago

Sounds likes a thermostat but doesn't explain coolant.. maybe coolant bypass elbows?? Mine went bad and leaked but burnt off on my exhaust so I had no puddle... Also I would get it pressure checked...

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