Resteemed! @socky, we just had the alternator replaced on a 2006 Scion, it had all sorts of crazy rattling but now sounds great.

My question is about a squeaky high pitch sound we are getting just when the car starts up. After it gets warm, it stops. I surmised that this can sometimes happen with new belts (like the new one on the new alternator), but really I'm just putting on my game face for the ladies.

Any real knowledge would be welcome!