Mechanics

PONTIAC GRAND PRIX HEATER PROBLEM

2007 Pontiac Grand Prix • 140,000 miles

About 2 years ago my car was blowing out cold air when I ran the heater I got the heater core replaced then it worked great. Last year I had the same problem I took it in they replaced the water pump and flushed it out. Iut worked great again. Now this year I have the same thing again. We changed the thermostat and flushed it again it worked great for a week and now its back to cold air. Is it the switch?
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Tedavi01
November 7, 2012.




When engien is warm see if heater hoses are both hot, if they are check the actuators in heater box. Check the actuator that I have pointed to in the pic


Hmac300
Nov 7, 2012.


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