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#1
12-16-2002, 10:20 AM
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engine compartment noise
1999 Silverado, 5.3 Truck has a high pitched whining noise, that sounds like a belt. We have replaced the fan belt, the belt that runs the AC, idler tensioner and alternator are new. Still can't pinpoint the noise. It seems to get worse, at a idle rather than at a higher rpm. It also only does this after it has warmed up and driven a few miles. Any ideas?
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#2
12-16-2002, 11:34 AM
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Did you replace the idler pulley? GM part number 12555609
There is a GM bulletin about a whine noise, the bulletin in very vague and only mentions that if it is not the belt making noise that is is a failed bearing in either the Tensioner or the Idler, since you already replaced the tens.,alt.,and belt you might try the idler. Online the part is 26.43 Hope this helps you.
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