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73-87 Chevy _ GMC Trucks => Interior & Equipment => Heating, Ventilation & Air Conditioning (HVAC) => Topic started by: rockable on January 18, 2010, 09:06:04 pm

Title: Heater/AC Blower has three speeds....
Post by: rockable on January 18, 2010, 09:06:04 pm

My '86 Silverado blower has three speeds - off, low and Hurricane Hugo.  I'm missing the two speeds in the middle.  I put a new control panel on it a year ago and I never noticed the problem with the blower speeds until this winter.

What can cause that?  Hopefully, it's something that I can get to without removing the instrument panel.  Sigh.

Thanks

Rockable

Title: Re: Heater/AC Blower has three speeds....
Post by: VileZambonie on January 18, 2010, 09:11:45 pm

Check the blower resistor. It's located in the heater box in the engine compartment.

Title: Re: Heater/AC Blower has three speeds....
Post by: Irish_Alley on January 19, 2010, 01:55:05 am

i have low-low missing low med high, but before i messed with anything i only had low replaced the resistor only to have the same problem while i had the resistor out in my hand i tapped on the relay box right under the resistor and fans cam on thats when i had everything but low switch the resistors back out and still had the same speeds. but like it was told to me give the s/c housing a tap around the relay and see if that fixes your problem the blower motor resistor will be right on top with a plug going to it