Urgent Help Needed ! - R33 Heater !

[woza01]

Hey !

I have just fitted an RB25DET Engine & Gearbox into my 1976 Datsun 260Z. I have also fitted an aftermarket Air-Con system because the standard 70's system just didnt measure up !

Anyway, I DESPERATELY need somone to help me identify which of the 2 hoses in the attached picture should go to the INLET side of the new heater core. I cant find anything in any of my manuals that tells me which is inlet and which is outlet.....

I have an idea what is correct, however so as not to influence your ideas, i wont say what it is.....Please only reply is you KNOW FOR A FACT that your answer is correct - from past expereince, when you ask a question on forums, you get so many answers and end up even more confused !.

Anyway, thanks for your help.....

Woza !!

Edited May 16, 2010 by woza01

[tuk32R]

hopefully this will help you out a bit....

[woza01]

Thanks heaps tukr32 - I appreciate your help !

Unfortunately, this doesnt offer any clues - I have this in my manual too. The arrows DONT indicate the direction of flow - they indicate the next section (diagram) and part number that connects to it....Bummer hey ! lol

Cheers anyway !

Warren

hopefully this will help you out a bit....

[tuk32R]

sorry-try this :Dtheres no other places that water goes to so this is the flow and return

Edited May 16, 2010 by tuk32R

[woza01]

I agree - those are the 2 pipes in question, however how do you know for sure that the one you have marked as flow, IS actually flow, and vice versa ?....Im not being argumentative, merely trying to satisfy myself in my own mind. If you are right, then what confuses me, is that the return pipe goes back to just behind the water pump, which is pumping water out at pressure - that water will want to go through that pipe that you have marked as a return.....

sorry-try this :Dtheres no other places that water goes to so this is the flow and return

[tuk32R]

Warren im pretty sure that the return connects back to the thermostat housing not the water pump- if the thermostat isnt open ,the water will continue to circulate around the engine without passing thru the radiator.The one marked return would have to be the return because when the thermostat opens,,the water returns to the radiator ,.as you know hot water rises thru the radiator/cooling as it goes then flows back into the top of the engine,,Does that make sense?, I'm 99.9% sure the diagram is marked correctly.........plse,correct me if i'm wrong,

Edited May 17, 2010 by tuk32R

[tuk32R]

i can tell you for certain that on my 32gtr the pipe coming from the thermostat housing goes to the bottom on the firewall,,,,,,,,and the back one on the block goes to the top on the firewall,, thats for certain, i just followed all my pipes and thats what i found . hope thats more usefull to you ,, Edited May 17, 2010 by tuk32R