2002 GMC Yukon AC Belt tesnioner makes noise at 2000 rpm

2002 GMC YUKON
105,000 MILES • V8 • 2WD • AUTOMATIC
Avatar
RICHARDLOGUE
  • MEMBER
  • 2 POSTS
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?
Jul 26, 2008 at 3:56 PM
Advertisement
Avatar
MERLIN2021
  • CERTIFIED EXPERT
  • 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.
Jul 26, 2008 at 4:29 PM
Avatar
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.
Jul 26, 2008 at 4:39 PM
Advertisement
Avatar
MERLIN2021
  • CERTIFIED EXPERT
  • 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.
Jul 26, 2008 at 6:34 PM