i have had a similar squeek for the last 3 years,
when it's really cold out, and first start the car, and accelerate it while moving, you hear the squeek. it's not the belts in my case, because i got new belts not long ago and sqeek still there when again like i said only really cold weather first half mile then it's all gone
i don't know what it is, but i haven't fixed it for 3 years now no prob ;p