5 replies to this topic

[JA50N]

can anyone tell me which pipe stub, on the heater assembly, the valve goes to and which one is for the bottom hose?

thanks

[james962]

I don't think it matters which way you connect it.

[Sherlock]

The pipe from the valve goes on the lower stub, the pipe from the bottom hose goes to the top one.

[JA50N]

i have my stubs side by side. is the lower and higher for the earlier heaters, as mine is the fresh-air system

[Ethel]

It won't matter much. It might bleed easier if the higher outlet is nearest the pump (bottom hose connection).

[GraemeC]

It doesn't really matter and you'll hardly notice any difference either way round.

However if I was analysing it I would put the outlet to the stub nearest the blower motor. That way the air getting blown through the matrix will be slightly pre-heated (by the coolant as it returns back to the engine bay) before it gets taken to a higher temp by the coolant coming from the engine.
Connected the other way round it could actually get cooled down again slightly.