Originally Posted by rustyroger
That is wierd!.
How cold was it overnight?, cold enough to make the belt stiff?.
I can't think of anything else that would make your car throw a belt if it is fine once it'* warmed up unless the tensioner and/or belt are worn.
The alternator will be at full load just after startup, hence the squealing for a while.
I'm not sure how cold it was last night, but it did rain a tiny bit; also, the day before, it was near freezing at night and about 65 degrees in the day. The belt wasn't stiff at all.
I've been questioning this Dayco tensioner for a while. I thought it was on its way out a while ago, but then it started behaving. Guess I might have my answer.
I'm pretty sure the squealing was just belt chatter caused by moisture, because I have no bad pulleys and it went away after it warmed up.