07'pontiac grandprix overheating low cabin heat

80

Asked by John Dec 30, 2014 at 11:14 AM about the 2007 Pontiac Grand Prix GT

Question type: Maintenance & Repair

my car is overheating and has somtimes low or no heat , I have replaced water pump , thermostat , radiator I have flushed cooling system car does not over heat all the time heat works sometimes I am Puzzled I am thinking maybe head gaskets or cracked head anyone ever had this problem and fixed it ? if so what was it thast was causing it

2 Answers
30,140

mikeatpriestlake answered 9 years ago

If you suspect a head gasket there is a test kit for about 40 bucks. There are good YouTube videos on how to do it. Scottykilmer.com has a good one. If you don't want to do it yourself, a lot of shops have a sniffer that they can use to see if there are combustion gasses in the radiator.

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1,605

Astre answered 9 years ago

Could be the heater core, check for leakage inside and outside the car.

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