Question about 2003 GMC Yukon XL
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.
Posted on May 19, 2009
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.
Posted on Apr 19, 2009
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.
Posted on Feb 04, 2009
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Posted on Jan 02, 2017
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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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