Re: electrical draw
Way worse than mine.
I have a 05 Yukon XL and it has a drain also. My cluster pulls a draw, the radio pulls a draw. Never heard about the AC. I have also read that OnStar can pull a draw. Don't forget to check the power seat. Hopefully your BCM isn't going bad.
I replaced the radio, re-wired the amp to get rid of the radio noise. Installed a rebuilt cluster. This series of vehicles have lots of electrical gremlins.
Smitty
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