2005 Pontiac Grand Prix coolant leak.

Asked by Mango008 Mar 29, 2020 at 02:23 PM about the 2005 Pontiac Grand Prix GT

Question type: Maintenance & Repair

While engine is idling the temperature
runs high. As long as the vehicle is in
motion the temperature is fine.  Heard
a hissing sound once I turned the
engine off and later found coolant
leaking on passenger side.    

2 Answers
2,320

RickMN answered 5 years ago

Get a cooling system pressure test if you can't find the leak on your own.

2 people found this helpful.
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26,995

taver91 answered 5 years ago

After you find and fix your leak problem, check out your cooling fans. They should run when the heat builds up at idle or when you run you AC. At normal driving speed, the airflow through the radiator and around the block is normally enough to keep the temp in the operating range,

3 people found this helpful.
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