Auto Parts: Blower fan only works on lowest speed, pep boys, multi tester

Question
The fan only works on low speed no matter what position the switch is in. It is a 1986 GMC. Do you have any ideas where to look?

Answer
Hi Benny,

Replace the blower resistor mounted to the outside of the air-exchange box under the hood. I'd make sure to multi-tester the leads coming off of the switch in the dash first to determine if maybe the switch has a few bad positions, but more likely than not, you'll fin the resistor has gone belly-up.

Looking for a reputable service technician? My advice on finding a good technician is: Steer clear of the dealership and 'chain' stores like Firestone, Sears, Pep Boys, Monro Muffler/Brake, Midas, etc. as they usually only employ ONE ASE Certified Tech just so they can say they do and chances are, that guy is the asst. manager or manager and is not in the store to diagnose/repair vehicles anyway. Find a service location in the link below or get some names out of the yellow-pages and do a drive-by. Garages that employ ASE Certified Technicians will be marked with the 'Blue-Seal' insignia. If unsure about whether a place employs Certified Techs, just ask to see their credentials. ALL ASE Certified Technicians will be PROUD to show and display their certificate(s).

Thanks for the question, I hope this information was helpful to you.
Fred
Knucklebusters Used Auto & Truck Parts, Inc.
www.knucklebusters.us
570-453-0910
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