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Don Knight
Don Knight, ASE Certified Technician
Category: GMC
Satisfied Customers: 1736
Experience:  Over 40 years working on all makes and models.
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GM suburban: 1992 gmc suburban 350 ... ac issue compressor

Customer Question

1992 gmc suburban 350 ... ac issue compressor will not cut in
no ac light flashing
low pressure switch is new and fine
Freon pressure looks good on the refill ... clutch spins fine pump spins fine
is there a relay some where that i cannot find that may be bad
thanks for the help
Submitted: 1 year ago.
Category: GMC
Expert:  Don Knight replied 1 year ago.
The a/c clutch relay is located on top of the plenum in the passenger side of the dash.If the relay is working you should have power on the dark green wire at the low pressure switch.If you don't have power there check the a/c heater fuse.If the fuse is good then I would next check the relay.Please let me know if you need more assistance,Don
Expert:  Don Knight replied 1 year ago.
Do you need any more assistance?