SOURCE: rear heat in 2004 gmc
I have a 2006 yukon and have had to replace the actuator in the rear heat/ac twice. It moves a valve that closes the cold/hot ducts. It is a cheap defective part/design.
SOURCE: removing the 2nd and 3rd row seats
3rd row, you simply pull the lever which makes the back fold down and then grip the handle located on the bottom and pull toward you slightly hard. They are heavy so it seems like they aren't coming out, just pull hard. second row, you flip all the way up and push with them standing up and they come unhooked. Good Luck! I didn't have any problems, except they are at least 50+lbs!
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: 2004 yukon seats are not working/heated seats not working
Check the fuses, the owners manual should be able to help you there.
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