It could be the mixer door actuator (a royal PITA to change) or the selector switch vacuum router (not half as bad as the actuator) .. that switch is both vacuum and electric and the hot summer takes it's toll on the O rings
Thanks, is there a way to differentiate one from the other?
pontiac grand prix no cold air and no heat but the fan works, whats wrong
2006 Pontiac Grand Prix Base
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Maintenance & Repair
The problem started today right after adding a quart of oil. Could something have gotten loosened or blocked in that process? Just wanted to check on the easy stuff before taking it in for a heater ...
2008 Pontiac Grand Prix GXP
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Maintenance & Repair
2004 Pontiac grand prix it won't start makes no noise at all but head lights work and radio. Whats causing it not to start?
2004 Pontiac Grand Prix GT2
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Maintenance & Repair
I've since replaced my radiator(due to leaks anyway) heater core, my heater actuator and the fanand motor in my car this still hasn't given me any heat when try to use console. Would this just be...
2000 Pontiac Grand Prix SE
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Maintenance & Repair
I have changed my thermostat, topped off my coolant using the recommended dexcool coolant, and bled the system off any air. But it is still not getting hot. My car does not overheat. Temp usually ...
2008 Pontiac Grand Prix Base
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Maintenance & Repair
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