1990 GMC Sierra not cooling

180,000 MILES • V8 • 2WD • AUTOMATIC
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LDR5385
  • MEMBER
  • 1 POST
truck a/c not getting cold blows cool air check low side pressure with engine off - 60psi no visible leaks like wet or oily spots. compressor motor turns clutch constantly engauging and disengauging. Low side pressure bounces from 30psi to 60 psi when motor running and a/c on when clutch is engauging and disengauging. what is wrong?
Jul 10, 2010 at 7:24 AM
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BLACKOP555
  • ✓Experienced Mechanic
  • 10,386 POSTS
what are the high side pressures doing were goign to need that information.
Jul 12, 2010 at 12:29 PM
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