sr heater lines- does feed/return matter? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

K_never_broke_again · 09-04-2019, 06:06 PM

Hey guys, Im setting up heater core lines on my sr/240sx swap, but Im not sure which way to route them. I've done a good deal of research on it, and I've heard some people say it doesn't matter which way you route the lines into the heater core. Is this true? I don't really know how this could be the case because the oem heater line valve when closed would cut off the coolant going to the turbo, at least thats my understanding of it. If anyone has any knowledge on this it would be great to know. Right now i have my lines set up like this- top of heater core line(with oem cable valve) going to the hardline that ends under/inside the intake manifold- and long hardline(with turbo coolant line) which wraps around the back of the engine looping back to the lower heater core port. Based on a few pics i've seen i think this is wrong, but let me know

duballstar37 · 09-05-2019, 11:12 AM

Sounds like you have it backwards... You can cut the hardline (shown below) or just route it back to the correct side.

jedi03 · 09-06-2019, 02:30 PM

you should also be able to tell if its backwards if you have heat when your car is running and the selector is set to cold...

S14rebuild · 09-06-2019, 03:25 PM

Quote:

Originally Posted by jedi03

you should also be able to tell if its backwards if you have heat when your car is running and the selector is set to cold...

Doesnt work that way

09-04-2019, 06:06 PM	#1
K_never_broke_again Leaky Injector Join Date: Nov 2018 Location: Maryland Posts: 50 Trader Rating: (0) Feedback Score: 0 reviews	sr heater lines- does feed/return matter? Hey guys, Im setting up heater core lines on my sr/240sx swap, but Im not sure which way to route them. I've done a good deal of research on it, and I've heard some people say it doesn't matter which way you route the lines into the heater core. Is this true? I don't really know how this could be the case because the oem heater line valve when closed would cut off the coolant going to the turbo, at least thats my understanding of it. If anyone has any knowledge on this it would be great to know. Right now i have my lines set up like this- top of heater core line(with oem cable valve) going to the hardline that ends under/inside the intake manifold- and long hardline(with turbo coolant line) which wraps around the back of the engine looping back to the lower heater core port. Based on a few pics i've seen i think this is wrong, but let me know

09-05-2019, 11:12 AM	#2
duballstar37 Zilvia Junkie Join Date: Aug 2007 Location: Eastbound and Down Posts: 490 Trader Rating: (10) Feedback Score: 10 reviews	Sounds like you have it backwards... You can cut the hardline (shown below) or just route it back to the correct side. __________________ P.A.T.T. Last edited by duballstar37; 10-08-2019 at 01:13 PM..

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09-06-2019, 02:30 PM	#3
jedi03 Nissanaholic! Join Date: Jul 2008 Location: albuquerque Posts: 1,784 Trader Rating: (8) Feedback Score: 8 reviews	you should also be able to tell if its backwards if you have heat when your car is running and the selector is set to cold...