Thread: 01 Grand Prix ES is a great car.

My GP has been good to me. Hello Everyone in the GP world.

My heater and A/C are going out. i can only get my heater to work on setting 5, and my A/C will not kick on at all. my a/c and heater settings gradually started going out starting with setting 1, then 2 & 3 went out, and all i have left now is setting five on the selector nob. this is a great car, but what could be causing this. i have replaced the blower motor, the blower motor resistor, and the head control unit, and still no fix. what gives?