i have a 86 iroc 305 tpi and recently when i drive for a lil and cut thecar off, it smokes out of the radiator(it came out a pinkish color one time) and coolant comes out of the coolant tank. and i get this nasty smell from the radiator. the day before i just put some coolant in it and its already gone the next day, but i hvent noticed any leaks.so i let the engine cool down and i try to put some water in it and within seconds the water came out a brownish color.

could it be a crack in my radiator? or something?

oh and my temp gauge in my car just broke so i couldnt tell if its over heating.

thanks a lot for your time.