My car has had no problems since today. I was at a stop and it quickly overheated. I checked the fan and its fine. The Coolant fluid level was fine as well. As i inspected the parts more, i opened the lid to the coolant and it had a sort of rust-colored mud. I thought maybe the coolant burnt when it overheated and that was the result but i wasn't sure. Is it my radiator? maybe my fluid was old? Can anyone please help me before i have to spend $982376428387423 on maybe something i could do myself?