2000 GMC Yukon Rattling

Tiny
NASCARFISH
  • MEMBER
  • 2000 GMC YUKON
  • V8
  • 4WD
  • AUTOMATIC
  • 160,000 MILES
My 2000 GMC Yukon Denali sounds like a diesel truck knocking and rattling while in park and driving at low and high speeds. The car runs like a top, nice and smooth, at 75 mph on the interstate but still makes these sounds. I drive in a lot of mud while hunting and fishing, so it sounds like maybe the pulleys and belts are dirty. I looked under the hood while it was in park and running and the sounds are not coming from the engine itself but from just in front where the belts and pulleys are. Could it be that the belts and pulleys or a bearing of some sort need cleaning or changing? Thanks for your input.
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Monday, February 22nd, 2010 AT 10:05 AM

4 Replies

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,549 POSTS
Yes most likely you have a bad bearing in the tensioner or another accy.

Remove belt on cold engine and run for 30 seconds, if noise goes away, then accy side for sure.
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Monday, February 22nd, 2010 AT 10:22 AM
Tiny
NASCARFISH
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  • 2 POSTS
Thanks so much. What happens if it goes out while I am driving?
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Monday, February 22nd, 2010 AT 10:25 AM
Tiny
2 LINSEY
  • MECHANIC
  • 287 POSTS
Thank you for your donation, we look forward to helping you in the future.
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Monday, March 1st, 2010 AT 3:44 PM
Tiny
MMPRINCE4000
  • MECHANIC
  • 8,549 POSTS
Remove belt and run engine ONLY for 30 seconds, then replace belt, this is only a test to isolate problem.
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Tuesday, March 2nd, 2010 AT 8:59 AM

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