Question about 1999 GMC Yukon

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Where is the hvac fan motor regulator located? I am down to high speed only, and need to fix the fan speeds.

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Under the dash on the passenger side. You'll have to remove the plasitc hush cover under the dash to get to it. The wiring harness and resistor assembly is what your problem is. It's very common with chevy's.
Once you get the hush cover off you'll see the resistor assembly right next to the blower motor just above where the passengers feet would be. It's about the size of a pack of cigarettes. You'll want to splice in a new wiring harness and replace the resistor. I just did this on my Chevy Truck. The parts were $179.00 and it was a pretty easy fix. The hardest part was putting the hush cover back on.

Posted on Dec 30, 2010

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RR/HVAC fuse 30amp located in the under hood fuse box. You can check it but highly doubt it's the problem . More then like it's the blower motor control module that's bad .
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The auxiliary blower motor is a variable speed fan. The HVAC control module controls the fan speed by sending a pulse width modulated signal to the auxiliary blower motor control module. The auxiliary blower motor control module varies the duty cycle across the auxiliary blower motor in relation to the pulse width modulated signal. The auxiliary blower motor speed can be adjusted from 10 percent to 90 percent duty cycle (PWM), 90 percent is high speed fan.
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You have a bad blower motor resistor. This is located under the dash close to the blower motor itself

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If you are certain there are no blow fuses, that leaves two things I am aware of that could be the culprit.

1. Blower motor resistor. Its a component, located inside the blower motor housing on that vehicle. Though, typically, when this goes bad it usually only takes out one or two fan speeds, like maybe speeds 1 and 2 or it might take out the high fan speed, its not really known for taking out all the fan speeds at once, although it could do so.

2. That leaves the blower motor itself. I dont see many of these go out without giving warning, such as making some kind of noise, but again, its not unheard of for them to just quit.

I would make certain that all the fuses are good, even check fuses under the hood that may provide protection for the HVAC system or even the blower motor itself.

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