2000 Pontiac Grand Am anti freeze leak

Scan for codes then have coolant system pressure checked for leaks lmay be ahead /intake gasket

Because O'reillys and autozone are parts people they aren't a mechanic. It's ok to get codes read there as they can only read engine an dtrans codes but they can't say why they are there. The leak you are talking about is very common on these earlier engines as it comes form the intake and sometimes head gaskets. But normally only apro or someone who repairs these have the experience to say exactly where. Obviously you are in no h urry to get his fixed.

It can be several things that is the point in my last reply I gave you a most likely cause of that year which is intake gaskets but it cold be head gaskets as well. Then you get into things like cracked heads etc. If your shop you took it to hasn't many complaints through better business bureau and is busy then they probably do good work at a fair price. Which for head gaskets is around $1200-1500 on your car depending on many things like coolant, hoses etc. We can't see the car nor test it ourselves so that is why we give answers like I have given. We (mechanics) are not like everyone thinks and that is to rip off everyone for our work. You don't have to do that just give an honest days work for an honest wage. Being a mechanic isn't easy, working around dirty engines and cars and people expect just any idiot can fix them. It's not like that especially today. Sorry for the rant