1998 Chevrolet Express a/c

1998 CHEVROLET EXPRESS
160,000 MILES • 5.7L • V8 • 2WD • AUTOMATIC
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LSLATTER
  • MEMBER
  • 1 POST
when i first start my car, th a/c comes on and works fine. after driving awhile, if i shut the motor off, especially if the ambient temperature is 90 or above, the a/c won't engage. it has 44lb of pressure and i've changed the relay. can you help?
Jun 15, 2015 at 12:01 PM
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WRENCHTECH
  • CERTIFIED EXPERT
  • 20,761 POSTS
If it has 44PSI of pressure on the low side, it has to be running. It would be much higher if the compressor was nor running.
Jun 15, 2015 at 3:59 PM