1997 Chevy Blazer - V6 - Automatic - A/C
>
> I have a "whistling" sound coming from my engine and I'm wondering if
> it's the belt tension pulley towards the top of the motor. I've had
> the alternator and a/c compressor recently replaced but I'm wondering
> about that pulley. The truck runs great with no apparent lack of
> performance - just a whistling noise that I'd REALLY like to get rid
> of. The sound goes "up and down" as I rev the engine while it's in > park.
>
> What would the symtoms/sound be if I had a bad tension pulley
> bearing? I've read here in the group that some people have had those > go bad.
>
> Thanks-
My tensioner went bad within a week of the alternator crapping out on me (alt first). If you have a friend around, you can lift up on the tensioner and release the pressure on the belt. Spin the pulley and see how it feels -- should be smooth and easy moving. When mine died, the bearings basically seized up, and the pulley stopped turning. This resulted in me needing a new belt (which was replace the previous week with the alternator). My truck is an 88 S-10 with the 4.3L V-6.
Big Chris