1999 GMC Safari Air conditioning

1999 GMC SAFARI
65,000 MILES • 6 CYL • 2WD • AUTOMATIC
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STANSM
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  • 1 POST
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
Jul 27, 2008 at 12:51 AM
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2CARPRO JACK
  • ✓ASE Certified Mechanic
  • 11,533 POSTS
  • ASE Certified Mechanic
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
Jul 27, 2008 at 7:54 AM
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