engine knocks when I switch on the air conditioning

2001 OLDSMOBILE ALERO
133,000 MILES
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LEOLUVSIT
  • MEMBER
  • 1 POST
When I turn on the ac compressor my engine pulls and makes a knocking and a high pitched noise. The cooling and heat work fine but when on, it takes the power from the engine. Higher rpms and has a more difficult time picking up speed. I can hear the engine pull. If I turn off the ac the car runs fine. Is it the compressor or the engine or even vacuum leaks?
Nov 16, 2011 at 4:24 AM
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ASEMASTER6371
  • ✓ASE Certified Mechanic
  • 52,796 POSTS
  • ASE Certified Mechanic
compressor has failed. leave it off till you have it repaired.

Roy
Nov 16, 2011 at 4:25 AM
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