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.
Its your blower control module( resistor ) a fancier way of calling it a resistor. Its located where the resistor would be, by the blower motor. it has three wires connecting to it. You cant tell if its burnt out by looking at it. Is it the digital dual dial type? If it is , then thats your problem.
This failure occured on my Yukon while still under warranty. Dealership replaced a fan relay located in the back, which allows for two-way control. Hope this helps.
Check your radiator fluid level, if it is low it is a good chance your heater core or the hose to the heater core has a leak. The heater core is a small version of a radiator which has the air from the blower blow across it to force warm air into the cabin of the vehicle. You will need to probe under the passenger's dash to locate the leak.
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I'm having the same problem on my 2001 yukon SLT. Need to help please!
I have the same problem except I have a 2004 chev Monte Carlo LS. I have checked all the fuses they are fine, But when I take the Heater Blower fuse out it shuts off completely, I have my thoughts that it is Fan Control 1 relay fuse but am not sure. Any and all help would be greatly Appreciated,
Thank you!
Justin.
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