1999 GMC C2500 air conditioning

1999 GMC C2500
89,670 MILES • V8 • 2WD • AUTOMATIC
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WERMEFENRC
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  • 2 POSTS
about 2 months ago i had my air conditiong unit charged at a local quick lube it was ok but but i wanted to ensure that the system was fully charged . A few days ago it was fine but when i used my truck today all it did was blow out hot air. What could the problem be.
Sep 12, 2009 at 3:14 AM
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PEAR69
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  • 1,482 POSTS
When you switch the AC button ON does the compresser kick in?
Sep 12, 2009 at 3:35 AM
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WERMEFENRC
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  • 2 POSTS
I just checked the system the compressor does come on however the clutch itself is moving and stopping every few seconds
Sep 12, 2009 at 10:26 AM
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PEAR69
  • CERTIFIED EXPERT
  • 1,482 POSTS
What is the pressure inside of the system? On the low side and the high side. Does the compresser make a knocking sound?
Sep 12, 2009 at 1:40 PM