Ive baught all new parts for car waterpump,thermostat,radiator,radiator cap hoses headgaskets rod housing radiator cap and still over heati g

What is your question?

Car over heats sometimes ill hear a screeching noise under hood when driving heater gets hot no leaks so why do i still over heat we've also burp itand when temp is up it footlocker on me. And it's like she (mustang Sallie ) want to die when I come to a stop . can someone please tell me why and what's her problem.my man says to trade her in for a newer one. But I'd like to keep her she a great car when she runs right. Plus I don't want to trade her in because she's paid for already and practically everything under that hood is brand new I clean the engine everything when we took it apart I mean we've done a lot of work to her bought her a new convertible top everything and I mean I love her but why does she keep overheating

What makes this problem better or worse?

Nothing

How long has your 1997 Ford Mustang had this problem?

For like a mo th now but really havent drove it too much cause i just put in all new headgaskets, rods, ect.