My wife's car is a 2002 Grand Prix GT with dual climate control. When the AC is on, the drivers side blows cold. The passenger side varies and then seems to blow hot. I did some searching and found the actuator for the pass side; removed it, opened it, plastic gears checked fine. hooked back up to to wire, started car, the actuator seems to wander back and forth if you you just touch the passenger side temp adjustment (not hooked to door flap), eventually going to hot. I moved door manually to close the hot air off.
Not sure if the actuator is bad or the hvac control module, or the temp switch?? any suggestions?? There is printed circuit board in the actuator. when i put 12v test light on the three leads, one lead (white w/stripe i think) reverses the motor direction. apparently going to ground
The drivers side responds and works fine when varying the temp control switch for that side.