When I start the truck after sitting for a few days or more there is a squeeling noise coming from the accessories area, pretty sure its not the belt slipping as its not that loud, belt is in great shape, and the sound does not stop immediately but goes away gradually in maybe 1 minute after startup. If it were a belt I'd think the noise would either be there or wouldn't. Also this only seems to happen if the weather has been humid or wet as if a bearing is rusting maybe. My car does this too and has for quite some time. Its just kinda annoying and if anyone can shed some light on this that would be great, more curious than worried.

 

I would pull the belt and check the Idler Pully and the Tensioner Pully. Good luck,

 

If it isn't the tensioner, I'd bet the belt is getting a bit weathered or hard, and has to get warm before it grips the pulleys...

 

Sounds beltish to me...

 

Thanks fellas. I guess I'll change out the belt and check the pulleys, good insurance anyway. Only have around 40k on the current belt though seems it would last a lot longer than that..