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Pontiac Repair/05 Pontiac Montana (not SV6) a/c and heater control switch


I turned the fan switch on the a/c and heater control to start the a/c fan and it came on fine then suddenly stopped.  I turned it off and back on again and it came back on but stopped again.  I cycled the fan switch on and off a couple of times and it would not come on again at all.  I removed the switch and tested it with a meter.  It tested fine.  Where do I look next?

Hi Lee:

unplug the blower motor and attach a test light to the wires and turn the fan on and see if the light lights dim on Lo and bright on HI and stays on and doesn't go out.  if it does then the issue is with the blower motor if it goes out like the motor the issue is more then likely with the blower resistor of the connector on resistor.

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Todd Puccio


General auto repair,electrical issues,driveability issues,anti-lock brakes,SIR systems,HVAC,engine performance,Gm specific. I have worked at my current dealership since the 1990 model year anything much older than that I have limited exposure to. I do not have very much transmission experience so those question you may want to ask of another expert. When you send me a question let me know the exact make/model/engine and year for the car or suv you have it makes it easier to answer the questions that way. If your happy with the answer I gave you please feel free to Donate. This is a free service to you and I am not compensated at all by this web site. I have 22 years of experience to share with you and my knowledge wasn't free to me. I had to pay for my education.


Experience in the area: I have been a technician in GM dealerships for over 22 years and I am a ASE master technician. I work at a Buick and GMC truck store Previously I worked at a Pontiac GMC store for 18 years. I Served a a lead technician when dealership was on a team system. I just recently moved to a Buick,Hummer,Saab Store when my franchise was purchased by this dealership. Organizations: ASE master technician


Education/Credentials:High school diploma,2 year vocational school degree 2 year college degree. Associates degree in applied sciences (auto technology)Awards and Honors: GMC master technician

Awards and Honors
Master GMC truck technician Master ASE technician in 9 categories

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