07 Yaris screach

[griz4718]

My 07 Yaris hatch back has a loud, high pitched screach only when the car is first started. I have installed a new serp belt and it is pretty tight. The noise is ONLY when starting, not continuous. Any suggestions???
Thanks :confused:

[TLyttle]

Water pump, alternator, anything driven by the serpentine, check for free rotation of these components. If any of them are tight, that will cause the screech; new bearings will cure the problem if properly installed. Bearings will howl when cold, then quiet down as they heat up...

[ViosFan]

Mine will do this too. I'm not quite sure what it is, but I think it just picks and chooses when to screech, since ive heard it when its warm and freezing out.