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Re: a/c goin crazy
had that problem on my 05 Denali after I replaced the control unit...did it like 2 times when my wife drove it. I jumped in the truck smacked the control and it worked fine ever since. as far as the fan sometime working and sometimes not...removed the blower motor resistor and see if it's starting to melt away (some of the old style GM blower motor resistors get hot and start to melt.) if so...jump on AMAZON and get you one...I got mine for about 25 bucks.
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