Mechanics

AIR CONDITIONING

1999 GMC Safari

Air Conditioning problem
1999 GMC Safari 6 cyl Two Wheel Drive Automatic 65000 miles

My air conditioning works good, except when I go up a long hill it shuts off. It comes on again when going back down hill. I check everywhere for a vacuum leak, as the controls are vacuum operated. The vac. Accumulator does not have a leak. My wife is driving me nuts because of this. Please help. Stan
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Stansm
July 27, 2008.




The vacuum feed lines on those are famous for cracking, be sure that isnt thecase here. If all good, you can try a vacuum check valve to keep the engine from draining the vent system or even a small vacuum resevoir if you van doesnt have one

Tiny
Jack42
Jul 27, 2008.


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