Assuming you have the appropriate vintage vehicle (none in your profile!), for the serp idler pulley, it's undergone several iterations:canderson:
I need one. Do you have the updated part number? Thank you.
Another possible point is the power steering pump.My wife's truck has a squealing sound from somewhere for the first 2-3 min lately. Do you think it's the tension pulley?? Water pump? Alt? Can't pinpoint it.
It's not a belt "squealing" sound. The belt looks good no cracking ect... I have replaced it but it's been awhile sence.. It's got 167,000 miles on it. I'll try the broom handle or something close to see if I can hear it.Pinpointing critical, and has to be done on your end. Tooooo many possible sources, and would have to hear it to even guess whether it's bearings in a peripheral device (e.g., alternator) or something else. Broom handle (sans broom, of course!) in ear touched to as many places as you can reasonably reach might be a good start since I doubt you've got the stethoscope to do it.
However, the fact that it goes away after 2~3 minutes makes it sound more like a serp belt (gets a bit stickier when it warms up) than anything else. Ever replaced it? Mileage? A clue?