2002 CHEVY SUBURBAN

  • Tiny
  • friedtators
  • 2002 Chevrolet Suburban
  • V8
  • 4WD
  • automatic
  • 144,000 miles

We are working on a 2002 Suburban with a 5.4, when the a/c is put on auto, or when you play wit the control the mode doors after awhile compressor will shut off, and compressor switch will flash, will loose the ground to the relay from the pcm, with scanner shows that switc is shut off, replaced control head, all a/c coponents are new. Sometimes will work fine for days, then wll go off. After about 30 minutres will work again.

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Wednesday, July 20th, 2011 AT 2:06 PM

3 Replies

  • Tiny
  • Docfixit
  • Expert
  • 18,991 posts

PCM grounds AC compressor so if ground is lost and Low Pressure switchhas tested good then PCM is faulty.

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Wednesday, July 20th, 2011 AT 2:36 PM
  • Tiny
  • friedtators
  • Member

Yeah it has a new low pressure switch

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Wednesday, July 20th, 2011 AT 5:12 PM
  • Tiny
  • Docfixit
  • Expert
  • 18,991 posts

When PCM got into control things got complicated and pricey

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Wednesday, July 20th, 2011 AT 7:03 PM

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