The speed control switch for the climate control fan motor on my 1996 GMC 4x4 mid size Jimmy operates just fine on the low and medium settings. When moved to the high setting the blower fan shuts off. The heating and cooling systems work great. Just the issue of not being able to get full use from the fan. Wondering if the problem is with the control switch itself or the fan motor. Not sure which to look at possibly replacing/repairing.
Hi,
found this for you..
https://www.2carpros.com/questions/gmc-jimmy-1996-gmc-jimmy-heater-blower-motor-not-working
SOURCE: Fan speed switch only works on #5
Call your local GMC Dealer and see if they have the climate control panel in stock. What happens is the circuit board on the back of the panel shorts out. The panel comes as an assembly and is very easy to replace. Don't go with a wrecking yard piece. I made that mistake once and it didn't work either. I got one from the Chevy dealer and it worked perfectly.
SOURCE: 99 Yukon - Blower Motor Not Working
replace the A/C control head... very simple to do. Pop off the dash panel and pull the control head out... unplug the 3 harnesses and there you go.
SOURCE: 99 Yukon - Blower Motor Not Working
If you have already changed the blower motor, than ignore my comment. My 99 Suburban blower didn't work on low speed, only medium high and high. I thought it was the resistor pack, so I changed it. The low speeds then worked, but I quickly noticed a burning smell at the two lowest speeds. I turned it off quick not to burn up the new resistor pack. I noticed one terminal of the fan switch wire connector looked to have gotten very hot in the past. I changed the fan switch but no change in symptoms. Still smelt like burning at low speeds. The motor appeared to work fine durning all this, but with nothing else to try we swapped out the motor for a new one and that sloved all the problems. The original motor was wearing out and though running fine was pulling to many amps through the fan switch and resistor pack. For those that haven't replaced the blower motor yet, I'd advise doing this as preventative maintaince so you don't burn up the resistor pack, fan switch, or wiring.
SOURCE: GMC Yukon Denali XL Auxiliary Blower Motor Battery Drain
Your new resistor should contain a built in relay. Sounds like that is sticking, swap the new part for another as it could be that you got a bummed replacement.
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