my 300zx was runing and coolant started leaking into the car. and is overheated. there was a big puddle of collant on the passanger side floor. so i let the engine cool down a little bit then put more coolant in it but it all leaked out on the floor again, as soon as i put it in. what is this from?
i think its from the heater core but im not sure!

 

that's the heater core...might want to check your hoses going to it, that might be the problem. If not, it's time for a new heater core.

 

alright thanks ,

 

but where is my heater core at and how would i get to it to replace it.??

 

it's on the passenger side of the cabin, under the dash, and behind your blower motor. It looks like a little radiator.

 

could i replace it my self or will it be too hard?