• Tiny
  • GHoward
  • 2005 Buick Terraza
  • 68,000 miles

I have a 2005 Buick Terraza with 68,000 miles. The A/C compressor clutch will not engage. I can bypass the compressor clutch relay and the compressor clutch engages and the A/C works great. I have checked the relay for continuity and I even replaced the relay. The new relay and the old relay have the same resistance. I have disconnected the battery in hopes of resetting any computer faults. That didn't help. Where do I begin to determine why the computer won't turn on the compressor? I have insured that the A/C controls are set on max A/C, the climate control knobs are set to max cooling and the A/C light comes on. The fuses are OK. When I bypass the compressor relay I use the compressor relay fuse as part of the circuit. Help Please!

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have the same problem?
Tuesday, October 2nd, 2012 AT 11:43 PM

1 Reply

  • Tiny
  • hmac300
  • Expert
  • 44,881 posts

;you'll have to see if the hvac module is telling it to turn on. If it doesnt' then it won't work. It could be your low pressure switch nea r evaporator, turnit on in car and jump the switch and see if it starts. If it does then it may be bad but have a pro change it.

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Wednesday, October 3rd, 2012 AT 12:05 AM

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