what is the problem? and what do i do to fix it?

oh yeah, my boyfriend started it and let it run while in park and he said its got a miss or a mist, something like that. well, i never heard of it before and he said idleing problem. and he also said its gets hot and the fan doesnt work and the radiator is full of fluid. also, when ya have the hood up while its running, it sounds like air is leaking and its very loud like when ya let air out of a tire when ya first put a tire gauge in but it doesnt stop, its constant. what in the world could that be?

I would get the codes read. Write down the number and post it. Someone will tell you probable causes. You can tell your boyfriend what to do. ;)