1991 CHEVY SILVERADO POSSIBLE PULLEY TROUBLE

  • Tiny
  • ron15
  • 1991 Chevrolet Silverado

Noises problem
1991 Chevy Silverado V8 Two Wheel Drive Automatic 125000 miles

Hi, I have a chevy silverado with a 5.7l v8. I recently changed altenator and serp belt. There is a whinning noise coming from that area, I changed both tension and idler pulleys and I still have the noises. Any help would be appreciated. Thanks

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Monday, June 23rd, 2008 AT 4:42 PM

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  • Tiny
  • Docfixit
  • Expert
  • 18,991 posts

Give it a good listen is the sound coming from the alt? If is a new or rebuilt unit?

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Monday, June 23rd, 2008 AT 5:11 PM
  • Tiny
  • ron15
  • Member

Hi, yes the altenator is rebuilt

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Monday, June 23rd, 2008 AT 5:30 PM
  • Tiny
  • Docfixit
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  • 18,991 posts

You think noise is coming from alt?
Dose whine get louder say if headlights or AC is turned on?
If so it could be rectrifer bridge or bearing.
Let me know

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Tuesday, June 24th, 2008 AT 7:11 AM
  • Tiny
  • ron15
  • Member

Hi, I believe it is AC compressor. Thanks for your help

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Tuesday, June 24th, 2008 AT 8:36 AM
  • Tiny
  • Docfixit
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  • 18,991 posts

You welcome if AC has been converted to 134a maybe oil charge might quiet it down.

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Tuesday, June 24th, 2008 AT 8:46 AM

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