Hello, I have a 2002 Pontiac Grand Prix and the heat and air barely blow any air. I bring it in but they say I will need to pay $400 to take the dash off and see what is wrong... Not going to happen. Can I do it myself? I am pretty sure the air filter and blower motor have been cleared. I can hear the motor (all 5 settings) and all of the switches and dials work.
You have a bad blend door motor. The dash has to be removed to do it depending on it's location.
Bill is right about the mode door motor causing this trouble and sadly the dash assembly needs to be removed. Very labor consuming.
Your blower motor needs replaced
SOURCE: the blower motor and AC works but the heater
if your vehicle has the electronic climate control, it is probably the blend door motor/actuator that has failed and is stuck at the temp that was last entered in the climate control unit when it failed. this can be a very time consuming repair to do as it is under the dash. the other possibility is your coolant level is low and not allowing the heater core to bring the outside air up to the temp you want. if that is the case,your low coolant temp sensor should have come on. if not, then the thermostat could be either stuck open or closed. if stuck open the engine would not always show the temp gauge at normal operating temp of 195-200 degrees. if stuck closed the engine should be overheating according to the temp gauge. you did not mention what the operating coolant temp was!
SOURCE: my brake fluid has turned black, why?
the fan switch needs to be replaced it is worn out on the lower speeds ..maybe youre brake fluid needs to be flushed and new brake fluid put in
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