Well I definately narrowed it down to the heater core. I cut the car off today when I got home and heard massively hot air pressure bubbling the hell out of the overflow tank. I grabbed the upper radiator hose and it was hot as hell and kind of stiff. Grabbed the bottom hose and it was warm. Grabbed one of the heater hoses, it was warm, and grabbed the other and burnt my hand.

So, question is, when I swapped motors I couldn't remember which hose went to which pipe. Does the direction of coolant into and out of the heater core make a difference? Is the core directional or can it flow both ways. Also, if that's not the case, what can I do to unclog the core without taking it or the motor out of the car?

And yes, that just happened. "Snow flake" button is the new name for that thing.

I CONTRIBUTED TO THE WIKI!
ah... turbo. I love the turbo, the boost, the speed, the sound.
and its all better when you do it yourself. cheaper too.