Question about 1993 Ford F150 SuperCab
These motors use three separate sets of blower motor windings which Low, Medium, and High. The chances are that the selector switch is ok and the High winding or set on the blower motor is not good.
I do not know the color coding of the motor to be able to put 12 volts on one of the windings of the motor to try and force the high to make sure it is actually getting to the motor.
The only way to be certain is to get to the Speed Selector switch and try and find out if 12 volts is being selected to the high side of the switch that goes to the motor. You will have to take the dash apart, which is easier prob. better than replacing the motor which is in the firewall. You might be able to replace it from the engine compartment at a autowrecker, but the high may be a problem Chevy had.
So if you figure out the color of the wire that is the 12 V high, then with the car on and in the high position, apply 12 directly at the motor by exposing part of the wire with a razor blade or a poke through with a sharp tool just to see if it comes on.
Temp solution - Assume the motor is good and the switch may be bad, Remove the medium speed wire and swap it with the High wire and see if it runs on high. Then you will have Low and High ONLY.
There is allot there good luck!
Posted on Mar 02, 2009
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