Which direction does the coolant flow out / in the heater core on an s13? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Black R · 12-17-2011, 04:09 PM

I'm just curious which way the coolant flows out of the motor and to the heater core.

I'd also like to know which way coolant flows out of the motor and into the radiator.

I'm going to put an aftermarket coolant temp sensor and gauge in (for lapping days) and want to make sure I put it in the right place.

codyace · 12-17-2011, 04:43 PM

It flows out of the upper hose, through the radiator, and then back into the edge via lower hose/thermostat

For the rest of the cooling system flow, check the FSM, I don't recall off hand.

Th OEM cooalant temp sensor is in the same housing that the thermostat is in. This obviously works for OEM cars. I personally put mine on the upper hose/head outlet side, to get an idea of how warm the car actually is once it hits the radiator.

I used a CustomSteel coolant adapter (Home)

Black R · 12-18-2011, 07:55 AM

Wait a second, if you're taking the temp in the upper hose then it never fluctuates unless the car is warm right?

I want to see what the temps are like after the radiator has cooled the fluid off...

*TheRealSy90* · 12-18-2011, 03:52 PM

So.... put it in the lower hose.

codyace · 12-19-2011, 02:57 PM

Quote:

Originally Posted by Black R

Wait a second, if you're taking the temp in the upper hose then it never fluctuates unless the car is warm right?

I want to see what the temps are like after the radiator has cooled the fluid off...

I have it in the upper hose to see what temps the water is coming out of the engine engine, not what it's doing going in.. If it's 195* coming out, I at least know it's under that going in, and that the radiator is working by giving the engine cool water.

badbob2121 · 12-19-2011, 03:14 PM

Thanks for that link Cody, great idea

codyace · 12-19-2011, 04:05 PM

Quote:

Originally Posted by badbob2121

Thanks for that link Cody, great idea

I mean the OE sensor obviously checks the water temp on the intlet to the engine, right in the thermostat housing...so take my comment as it is. I just prefer to know what my car is doing after it's all said and done ya know?

cotbu · 12-19-2011, 04:45 PM

Sounds good to me, you can also verify that the thermostat is opening when it should.

Black R · 12-20-2011, 11:57 AM

Cody, I wasn't bashing - just thinking out loud:

The temps coming out of the motor will always be the same presuming your thermostat and water pump are working correctly right? So that gauge won't show much deviation ever.

I figure I need to know the temps that are going into the motor - that will tell me if the radiator is working enough, along with the thermostat, and water pump.

I think we can all agree that the stock temp gauge is just a dummy light.

12-17-2011, 04:09 PM	#1
Black R Zilvia Addict Join Date: May 2009 Location: ATL Posts: 642 Trader Rating: (0) Feedback Score: 0 reviews	Which direction does the coolant flow out / in the heater core on an s13? I'm just curious which way the coolant flows out of the motor and to the heater core. I'd also like to know which way coolant flows out of the motor and into the radiator. I'm going to put an aftermarket coolant temp sensor and gauge in (for lapping days) and want to make sure I put it in the right place.

12-17-2011, 04:43 PM	#2
codyace Post Whore! Join Date: Dec 2004 Location: Poconos, PA Age: 36 Posts: 8,030 Trader Rating: (58) Feedback Score: 58 reviews	It flows out of the upper hose, through the radiator, and then back into the edge via lower hose/thermostat For the rest of the cooling system flow, check the FSM, I don't recall off hand. Th OEM cooalant temp sensor is in the same housing that the thermostat is in. This obviously works for OEM cars. I personally put mine on the upper hose/head outlet side, to get an idea of how warm the car actually is once it hits the radiator. I used a CustomSteel coolant adapter (Home) __________________ *Want Air Conditioning in your SR20 Swapped car? Check out www.sr20acbrackets.com for more information! Quest Alternator Conversions for SR20!* Check my Group Buy! Tired of lousy internal gates? Go external wastegate with one of my manifolds, Check out my group buy

12-19-2011, 03:14 PM	#6
badbob2121 Zilvia FREAK! Join Date: Feb 2010 Location: St. Louis Age: 33 Posts: 1,261 Trader Rating: (7) Rides Gallery: badbob2121 Feedback Score: 7 reviews	Thanks for that link Cody, great idea __________________ FOLLOW ME ON INSTAGRAM = BOBBY_LS13

12-19-2011, 04:45 PM	#8
cotbu Post Whore! Join Date: Sep 2005 Location: SWFL Age: 47 Posts: 3,318 Trader Rating: (3) Feedback Score: 3 reviews	Sounds good to me, you can also verify that the thermostat is opening when it should. __________________ LoverTechnologies "Half Broken Things!"

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12-18-2011, 07:55 AM	#3
Black R Zilvia Addict Join Date: May 2009 Location: ATL Posts: 642 Trader Rating: (0) Feedback Score: 0 reviews	Wait a second, if you're taking the temp in the upper hose then it never fluctuates unless the car is warm right? I want to see what the temps are like after the radiator has cooled the fluid off...

12-20-2011, 11:57 AM	#9
Black R Zilvia Addict Join Date: May 2009 Location: ATL Posts: 642 Trader Rating: (0) Feedback Score: 0 reviews	Cody, I wasn't bashing - just thinking out loud: The temps coming out of the motor will always be the same presuming your thermostat and water pump are working correctly right? So that gauge won't show much deviation ever. I figure I need to know the temps that are going into the motor - that will tell me if the radiator is working enough, along with the thermostat, and water pump. I think we can all agree that the stock temp gauge is just a dummy light.