1988 GMC 1500 pickup A C unit. Where would the(Filler), high side be on the AC lines..

Asked by Cliff Jul 11, 2015 at 04:36 PM about the 1988 GMC Sierra 1500 C1500 Standard Cab SB

Question type: Maintenance & Repair

1 Answer
70,125

Kelly answered 8 years ago

you want to fill the high side? look for the hose that goes into the cab (the low side hose) and along it you will find the fitting > this might help you...when you find it than the other one is the high side.

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