I need some help too.. Here's my story:
My car was running good, no screeching from under the hood for a couple months..
One morning I start it up..Screeech!!! It lasted for about 30 secs and when the belts warmed up, the noise stopped. It did that after every cold start.
I finally put the car on the lift and put some more tension on the belts.. The noise stopped and all was good for a couple weeks.
Well, my belts started screeching again and so I took it to the mechanic and they put new belts on (from Nissan) and a couple days later took it in again to have them tighten the belts again. It started screeching again, and I had them replace a leaky power steering hose.. (hehe, they told me that was the problem). Now the dang belts are still noisy on cold starts, and I don't know which one.
Could the problem be with the tensioners? Could there be a stripped bolt that keeps coming loose??
I don't know and was wondering if there's a way to replace the tensioners / bolts and if anyone knows where I could pick them up.. I was guessing a Nissan parts store.
I live in Japan and the local Nissan dealer said they might not be able to look at my car because of the mods I have done to the car (i.e. the mirrors don't retract in, haha).. And I don't trust the local mechanic, so I'll do it myself. Thanks for the information, and help, in advance
By the way, I have a '93 GTS25T, with stock engine. I'll post everything in my profile later:) Thanks