It would blow on low settings sometimes and sometimes on high and sometimes it wouldnt blow at all. i would have to turn it on and off several times to get it to work.
Could be the fan switch, the resistor, or the blower motor. A mechanic would check for voltage at each point and also the ground connection for the motor.
SOURCE: climate control 04 yukon denali
Removing the fuse for a few minutes and turning the controls on both driver side and passenger side to the highest setting and then turning them down slowly until the system started cooling has worked for me. Thanks for the suggestions---saved me $2500.00 on a useless dealer estimate to fix problem. These dealers are dangerous---they were the ones that caused my problem when they unhooked the battery while replacing my ignition switch.
This is a good forum.
SOURCE: 2004 GMC Yukon Denali
My wife had same problem in 2005 yukon. Turn both temperture controls on dash all the way as warm as they will go, Wait about 1 or 2 mins and turn back to coolest setting. Cleared our problem right up. Do this with car running and air on.
SOURCE: 2006 Envoy SLT air suddenly stopped blowing from vents
the resister block needs changing... oddly enough i'm unsure of what fan you are saying is not working.... if it's the front.. the resister block is located on the duct work under the dash for the air... near the fan... you will see a connector going into the side of the duct work. two screws and the block comes out... should be fairly obvious for the rear one but it will be near the fan.
SOURCE: Yukon a/c blower doesn't work on low settings
I really think the Blower resistor is at fault.
It is located on the Passenger side, directly next to the blower motor.
It has a 7 or 8 wire connector from controller, and then the 2 wires coming out for the motor.
They are VERY common problem.
2 small screws holding it in.
easy fix.
Part SHOULD cost in the $40-$50 range Depending on which Auto parts store you go to, Auto Zone will have this part and can give you the step by step instruction to get the job done.
Hope this helps.
Good Luck
SOURCE: 2006 Yukon Denali, oil pressure gauge malfunction
Most likely the oil pressure sensor is bad. Its located in the very rear of engine on top of bell housing area.
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