C3500 Rattling (like marbles slowly) stops during acceleration

Tiny
GINJA111
  • MEMBER
  • 1989 CHEVROLET SILVERADO
  • V8
  • RWD
  • AUTOMATIC
  • 96,000 MILES
Can hear it coming from engine compartment upon idle. Stops or gets dramatically reduced when you accelerate. Upon listening under good it appears to be coming from A/C compressor area, almost sounds like it needs some form of lube or something. It also seems to get better upon engine heating up but can still hear it is going very slow or idling. Almost like someone has a hand full of marbles and is slowly circulating then around in their palm.
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Tuesday, October 27th, 2015 AT 3:39 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,005 POSTS
First, remove the serp belt and start the engine for a few seconds to determine if the noise is gone. If it is, turn all belt driven accessories to determine which one is making the noise. Make sure to check the water pump too.

Do this and let me know what you find.
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Tuesday, October 27th, 2015 AT 5:31 PM

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