squeaky noise
You could remove your main belt and run the car, you could also remove the A/C belt to try and isolate the problem.
Since you have an UD pulley, you may need a new tensioner to stop it from happening.
If it stops, you know its the main.
If it keeps doing it, you can remove the a/c belt and repeat. You may also want to run over your idler pulley bolts with a wrench to make sure they are tight. My main belt idler pulley started SCREAMING on the dyno at HPE while getting tuned.
If I was getting a new tensioner, I'd get the Katech one.
https://ls1tech.com/forums/generation-iii-external-engine/501358-introducing-katech-s-new-design-billet-belt-tensioner-now-pulley-same-price.html
It's very easy to change as it's only held on by 2 bolts through the waterpump.
https://ls1tech.com/forums/showthrea...highlight=belt
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Perhaps I'll get a new tensioner afterall.