SOURCE: 2003 GMC Envoy lower 3 heater fan settings quit working.
had same problem on my XUV. changed the blower motor resistor, located under passenger side dash. easy to change, works no problem.
SOURCE: The Heater fan in my 2003 GMC Yukon XL will not turn off
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.
SOURCE: drain and replace power steering fluid in my gmc
generally there is 2 hose going to the reservior , usually the small one it the inlet, take that off anbd put a blocked off hose in place. put into a bucket, have a few liters handy turn the car on and have some1 fill it keeping it full, warning it will come out fast. and have some1 turning the steering wheel lock to lock. untill clean, the turn car off
SOURCE: Replacing heater core in 2000 GMC sonoma. Dash is
If the dash is removed you've saved about 9 10ths of the job endurance. Look around, what you believe to be, the perimeter of the heater box. I cannot, and no one else can, tell you exactly where the bolts and nuts that mount the heater box are. Therefore you must viually sixe the box and check outide in the engine compartment and inside under the dash for the mounting bolts.You'll want to start by removing the heater hoses. Then starting at the passenger side engine compartment look for a group of 10mm or 7/16ths nuts retaining the housing and remove them. Do the same inside. The housing is usually held together with screws or clips, it changes year to year. Keep a log or pix of the wires and cables and hoses(vacuum) that are connected to the housing for reassembly. You'll need to "roll" the box out from under the dash depending on how much of the dash has been removed. The core is easy to spot for is has two hoses sticking out, and, is encircled with clips or screws . Also make sure you remove the bracket around the two entry hoses if it has one. Thank you, Dana
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