Squeel/chirping at startup

[WoodBoy]

Which pulley/tensioner is prone to go out and what are they covered under as far as warranty? 3yr? 5yr?

I get a squeel a sometimes on cold mornings, sometimes a chirpy/gritty type sound. Im guessing a pulley?

 

[webb06]

My squeel/chirp turned out to be the belt. I replaced the idler on the top passenger side with no fix. Then replaced belt

 

[6.4stroke]

The idler pulley is the most common pulley to go out. I beleive it's covered in the 36k mile warrenty. Plenty have ppl have done it themselves tho to save money.