Often it is the tap that leaks

well the lines that can be seen semm to have a tight connection. i guess i will try taking it out this weekend and either fix it, or route the lines into eachother. it's getting warm here anyway.

"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.

if the heater core is bad - bypassing it is easy..

there should be a connection coming out if the back of the cylinder head... and the one coming off where the lower radiator hose attaches to the engine... connect both of those together and the heater is bypassed..

I'm curious on how the models without heaters like the panelvans were done

apparently the UK spec 120Y panelvans had no carpet, no seatbelts, no stainless steel trim, no heater, no radio, no cigarette lighter..