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Re: 2004 yukon xl the fan only works on high. was told...
The resistor is located in bottom of heater box under right side of dash it will be close to blower motor. the wires from blower motor go to resistor. check the plug and replace it as well they tend to melt
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if it works in any position low-to-high then it is the blower motor. if it only works on high or works well on high but no where else it is the resistor. Good luck!
it is the blower motor resistor. I do not know off of the top of my head if it is part of the climate control unit or external for your particular vehicle. However the symptoms match.
I just changed the resistor on a 2000 F-150 hopefully it's in the same spot. It's under the dash on the passenger side it toward the front of the truck from the glove compartment. I had to use a mirror to see it but, I'm a big guy and I'm getting old so I can't get into those tight spots anymore. But, that's the problem if you only have "high". Merry Chrsitmas!
I don't know if you already fixed it, but I had the same problem on my 03 yukon, TysonRicky is right. In my case it was the blower control module. You can find it right under the glovebox. It cost me close to $100 for a new one, but very easy to replace. Can't even imagine how much it would've cost me if I had a mechanic do it.
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