1990 Chevy Truck Noise after changign system to 134a

1990 CHEVROLET TRUCK
175,000 MILES • V8 • 2WD • AUTOMATIC
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KRAMER0424
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  • 1 POST
My A/C has been converted to 134a and the entire system has been replaced with new parts from NAPA auto parts. Question...When truck is idling with the A/C on the truck has a Growl or Harmonic sound coming from around the compressor area. When driving normal you do not here the noise, only when idle or not pressing on the gas. I had a certified repair person do the work and he has replaced the compressor and other parts twice. Still the same noise. Any Ideas
Mar 16, 2009 at 12:05 PM
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DOCFIXIT
  • ✓ASE Certified Mechanic
  • 18,828 POSTS
  • ASE Certified Mechanic
What is high side pressure at idle? What is idle RPM?
Mar 16, 2009 at 2:34 PM
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