2000 Chevy Venture load Nocking

2000 CHEVROLET VENTURE
103,000 MILES • 6 CYL • FWD • AUTOMATIC
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SWRKINGDAD
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  • 1 POST
My AC makes a Nocking noise when we turn it on when we shut it off everything is fine. It is on a 2000 chevy venture. What could be the cause of this?
Jul 19, 2009 at 11:13 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Noise from the compressor usually means the compressor is on its way out. But noise can also be caused by cross-contaminated refrigerant (operating pressure too high), air in the system or the wrong type of compressor lubricant.

Noise can also be caused by hoses or other parts rattling against other components in the engine compartment. Check the routing of the hoses, support brackets, etc., to pinpoint the noise.
Jul 19, 2009 at 11:38 AM
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