Ac Blower Motor Not Working

[knightgang]

I have a 2001 Chevy 1500 HD, 4x4, 6.0 ltr with Auto Climate Control. Everything was fine one day and the next, the blower motor would not work. I usually leave the AC on, either on Auto or with the fan control about 1/2 to 3/4 the way turned up. On this particular day, someone else drove my truck and the turned off the AC using the Fan control knob turned to off. When I got in and turned the AC back on, the compressor kicked on, but the blower motor would not work. After several days of trying to trouble shoot, I finally straight wired the blower motor with a switch to get through the summer, now I need to fix it before it gets cold so that I can have heater. Here is what I have done, tried so far.

 

1st thought was the blower motor module was bad. Bought a brand new one off of E-bay. No dice, motor still not working. (Again, with 12V direct it works just fine).

 

2nd, tested the voltage at the plug that goes into the blower motor module. I get 12v across the orange wire and the black wire, then I get .01 to .05 volts across the black and the grey/white depending on the position of the fan control switch.

 

3rd, with the blower motor plugged in and testing at the plug that goes into the Blower motor, I get .08 volts ragardless of fan switch position.

 

4th, I have disassembled the AC Control head and cleaned inside the fan control switch, no change.

 

At this point, I feel like the control head is bad, but at $135 new (cheapest I can fine) or even $85 used, I want to be sure that is the problem before I spend the money. Is there any other advice you have for me or other testing to be done to be certain it is the control head that is bad. Bear in mind, all other functions work just fine, blend door, Fresh air/Recirculate, Vent/Defrost deflector door, etc. Only the blower motor will not work while plugged in to the system as it should be.

 

Please help...

[JoJoJim]

Have you checked the resistor which is located in the duct just left of the blower motor. Two screws to drop and to snap out wiring harness attachments. It was a problem in mine that when it goes bad the blower motor will not operate. Worth a try as fast and easy. I just don't know if there is a way to test it.

[knightgang]

Have you checked the resistor which is located in the duct just left of the blower motor. Two screws to drop and to snap out wiring harness attachments. It was a problem in mine that when it goes bad the blower motor will not operate. Worth a try as fast and easy. I just don't know if there is a way to test it.

 

 

Mien is auto climate control, no resistor, but a blower control module instead. Completely different animal.

[Kirkathon25]

that blower control module goes, i think the blower motor in these trucks come from the factory not-working, mine only works on 3 and 4

[JoJoJim]

Strange it has no resistor module as my 2007 Denali has one and that is what was wrong with it.

[kurt1993]

my blower motor only worked on 5 then not at all it was some circuit board that needed to be replaced.... it cost quite a bit but now my a/c and heat works on 1-5 so im hapy but i think it was like a $400 fix installed and everything.