2000 GMC Sierra engine pulley noise

2000 GMC SIERRA
236,000 MILES • 6 CYL • 2WD • AUTOMATIC
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WILDTHING
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  • 9 POSTS
I replaced the idler pulley but there is still bearing noise on start up then goes away after the engine is warm.
Jan 30, 2008 at 1:14 PM
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GM4YRS
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  • 5 POSTS
Check the a/c tension pulley. Hard to see from top, look under truck with plastic shield off . I tried to wd-40 a few times, but sound returned. Bought new one at the dealer.
Feb 1, 2008 at 7:35 PM