Check to see if blend door motors move
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: Heated Seats, Yukon Denali
You will need to replace the switch module, it is the only thing that can cause this to happen
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.
SOURCE: Heated seats won't stay on in 2004 GMC Yukon Denali
See GM TSB 05-08-143-001, If you have Adjustable pedals, especially if they don't work with the memeory buttons, but function with thier own buttons. Its the Brake Pedal Position Sensor is shorted and mesing up the seat module which controls the heaters too. My 05 Suburban had the same issue
SOURCE: 1996 yukon no heat at all blowing out cold air
Verify the coolant level is up, feel the heater hoses, are they warm?
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