2002 GMC Yukon AC Belt tesnioner makes noise at 2000 RPM

Tiny
RICHARDLOGUE
  • MEMBER
  • 2002 GMC YUKON
  • V8
  • 2WD
  • AUTOMATIC
  • 105,000 MILES
I have replaced my belt and tensioner and it still makes a squeeling noise at about 2000 rpm. The tensioner starts flapping when the belt starts to slip. I have also replaced the ac compressor and the pressures are 35 low and 225 high. The ac is on a separate belt with only a tensioner. This is the 5.3L engine. Any suggestions?
Saturday, July 26th, 2008 AT 3:56 PM

3 Replies

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Take the belt off, and try to spine the A/C puley and alternator, we are checking the pulley bearings for roughness or binding, if it has an idler check that one too.
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Saturday, July 26th, 2008 AT 4:29 PM
Tiny
RICHARDLOGUE
  • MEMBER
  • 2 POSTS
I have replaced the compressor and the tensioner pulley. There is no idler pully. The pressure on the AC is 35 psi low side and 225 high side.
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Saturday, July 26th, 2008 AT 4:39 PM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Do you have a 5.7? If yes check the pulley on the crankshaft, some of them don't line up with the rest of the pullyes, and need a new harmonic balance. You will notice it by the belt hanging over the end of the pulley.
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Saturday, July 26th, 2008 AT 6:34 PM

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