"b310gx wrote:
For the Heater not working, where the hose off the back of the head goes through the firewall & into the heater, there's supposedly a valve that turns on & off the hot water to the heater core. This might have corroded into the closed position"

so the lines seem to be fine on my heater core. it seems to be leaking from the core itself. i was going to re-route the lines so the coolent cycles properly and stops dumping onto my floor.{not good for rusty datsuns} plus it runs on the hot side because of this i think. but after re-reading all the post i am looking for this "valve" b310gx talked about. if i just close it off wouldn't it have the same effect? if someone could tell me where this valve i would really appreciate it. re-routing the lines would be pointless if i could just shut it off. i have the haynes manual but it doesn't talk about the heater stuff much. thanks again.