why does my A.C. not work


Asked by May 11, 2015 at 09:16 PM about the 1998 GMC Sierra 1500 C1500 Special Standard Cab LB

Question type: Maintenance & Repair

I have a 1988 GMC Sierra 1500 pickup. I refilled the air with freon and put it up to the right pressure but the pump will still not come on. I hotwired the pump and it kicked in. I'm wondering what the problem may be. The heat works and the air blows good. Just the A.C. pump is'nt working. Any help would be appreciated thanks.

1 Answer


Low pressure switch failure is the most common. If your pressures are correct then that is most likely your problem.

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