My heater blower started quiting and then working on and off about a week ago. Well it finally quit for good. I tore the blower out and it runs fine when i tested it. So i go back to the car and test the power lead going into the motor just to make sure and the lead is hot only when the fan switch is in teh highest setting. The other 4 speeds have nothing. Before i removed the blower motor i had no power at all there. I remove it from the car and now the lead has power at the highest power setting only???!?!?!? So i brought the blower back out to the car and sure enough it will run on high but no other speed.
I assume its either the switch or some control box somewhere. What do you guys think and where is it located.
THanks!

 

anybody? IDK whether to replace the "control box" or the switch.

 

The two pictures are of the heater control unit out of my 91 DX. As you can see you just pull the knob off, remove the two screws holding the switch from the back, and it can be replaced by itself. That's the easy part. Removing half of your dash to get to to those two screws is the hard part.