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2003 Chevy Silverado AC Making noise

Tiny
MCGUIVER35
  • MEMBER
  • 2003 CHEVROLET SILVERADO
  • V8
  • 4WD
  • AUTOMATIC
  • 75,000 MILES
I have a 2003 Silverado and when the ac is on and idle there is a vibration, and when I accelerate this turns to a screeching noise I have replaced the belt and tensioner and still the problem persists, the High side and low side lines vibrate violently when this happend and will do in drive or park. Almost as if the compressor is trying to lock up any ideas?
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Friday, July 11th, 2008 AT 3:28 PM

3 Replies

Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,750 POSTS
03073330000106452009

we need to know what the pressures are in the ac system. High high side pressure over 250 will lock the compressor up and cause your problem. A bad fan clutch can cause high side pressure to be high.
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Friday, July 11th, 2008 AT 3:48 PM
Tiny
MCGUIVER35
  • MEMBER
  • 1 POST
I havent checked the high side pressure yet but I will dont thing the fan clutch is bad no over heating even when towing and can hear it and makes noise all the time even when cold, could it be the high side pressure switch? Just a thought. And how would I check the switch for proper operation? Thanks for all of the help
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Saturday, July 12th, 2008 AT 8:51 AM
Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,750 POSTS
We need to know the pressures.
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Saturday, July 12th, 2008 AT 10:34 AM

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