It makes a rattling sound when there is a load on the engine but only at idling speed. Sound originates from passenger side underneath. Possibly at the back of motor. We have heard it on other silverados. Seems to be more prevalent when air conditioner is on. But doesn't seem to be associated with the air conditioner clutch. Noise does not seem to be around that area.
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Wednesday, September 15th, 2010 AT 8:04 PM
2 Replies
JACOBANDNICKOLAS
MECHANIC
109,747 POSTS
Take a rubber mallot and tap on the exhaust system to see if you can duplicate the sound.
Let me know what you find.
Joe
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Saturday, September 18th, 2010 AT 11:33 PM
DROPLRG
MEMBER
1 POST
I have same noise on my 2005 silverado 4x4 crew cab dealer cant find any issues