So i have a leak. I'm pretty sure it's coolant. if i drive for an hour or so, when i stop it would steam. (i guess it was leaking onto the exhaust). I put a sort of MacGyver-esque fix on it. so far so good. I just need to know the name of the hose so i can order a new one. thanks.

 

It's the upper heater core hose.

 

I wouldn't go through the trouble of trying to hunt down a factory replacement. Just go to your local auto parts store and buy a couple of feet of heater hose (it's a specific size just ask for heater hose, they will give you the right size) and buy a couple hose clamps. The only circumstance where you would need a factory specific hose replacement is if you need a molded hose.