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2003 chevy suburban no ac...power problems help


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2003 chev suburban, 5.3 ....Auto climate control....

The ac is not working, its fully charged we have it down to no power coming out of the dark blue wire out of the control head, we even tried a new control head and checked ALL fuses no luck,...what im trying to find out where is this getting its 5v from? Im sure im missing something really stupid, where do i start checking next...thanks guys!!!

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