Abrasive noise on cold starts in 1999 Mustang GT
My 99GT (totally stock) recently started making a constant noise on cold starts that I am having trouble diagnosing. It sounds basically like a motor or fan bearing going bad because it is a fairly loud whir resembling parts rubbing (there is no screeching), but the particular tone makes it hard to determine where it is coming from. It modulates just a little when the a'c compressor kicks in and out, but it is still audible when the a/c is off.
So far (about 3 days), it goes away after a few minutes of the car running and it is worse when I start it in the morning that in the afternoon when I leave work. I notice no ill effects in performance, but I don't want to wait for that to change, ha.
Any thoughts on what parts could be causing this? Alternator, belt, or even something physically rubbing up against a moving part? About to take another visual inspection, but I thought I would see if anyone else had experienced something like this.