It might have a belt in it that is getting a little loose. No big deal. Car fan belts can squeel for ages when slightly loose with not major issue. If it explodes I will deny this post claiming someone hijacked my account.
I think I have a fan belt going. :-\ When my car is a) coldish and b) at a stop, but with the engine running (like a stop light or intersection), it squeals HORRIBLY. Just started a few weeks ago. It’s embarrassing, but since the car seems to be running OK otherwise, I’m hesitant to bring it in.