SR20DE S15 coolant flow direction for heater valve? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Goldhawg · 09-01-2020, 05:33 PM

I have an SR20DE S15 I'm swapping into a Datsun Roadster and I'm not sure I'm reading the FSM correctly on coolant flow. I think the hot out of the engine is the tube closest to the block (the larger 90 deg 3/4" hose) but I wanted to be sure. I need to put the heater valve in and I want to be sure on the coolant flow out of the engine. Can anybody confirm which of the two lines coming out of the block/thermostat housing is the hot out?
Thanks!
PS, love to attach a pic but site won't let me (I am approved and file is only 222kb).

S14rebuild · 09-01-2020, 06:45 PM

Host images on imageshack or imgur

Need pics to help

Goldhawg · 09-02-2020, 04:20 AM

Can you check out the picture on c/l I created (just to host the picture)
dayton.craigslist.org/wan/d/spring-valley-wanted-silicone-heater/7188741153.html

S14rebuild · 09-02-2020, 05:27 AM

https://www.google.com/search?sxsrf=...nlo8bygBwNFL5M

Here u go

Goldhawg · 01-31-2021, 08:45 PM

Bump as I still don't have an answer on this. Anybody know which direction the coolant flow coming out of the block goes?

5t341tH · 01-31-2021, 09:50 PM

you talking about running into the heater core inside the car?
If I remember right, it doesn't matter. On my datsun swap at least

Goldhawg · 02-01-2021, 04:03 AM

Yes I am talking about the heater core. However, the valve that goes with my my aftermarket (Vintage Air) Evaporator/heater core has a direction to it for flow. So I want to mount the valve in the correct direction. I don't like only having a 50-50 chance of getting it right as it's kind of a pain to mount in my roadster (very little room) and I'd like not to have to go back in the future and take the intake all apart just to get down and reverse the valve so I can have heat.

5t341tH · 02-02-2021, 07:14 PM

I've found this

Goldhawg · 02-02-2021, 08:30 PM

Thanks. But this is the FSM that I have, and its not clear to me how this matches my thermostat/block housing. See the picture of my setup here:
https://www.facebook.com/photo/?fbid...88586861345626

My problem is the FSM shows the line closest to the block as going into the thermostat. But you can see on the facebook page that the line closest to the block is not going into the thermostat. This FSM picture just isn't clear to me.

5t341tH · 02-03-2021, 09:19 AM

I’ll look at my swap and see. Although mines s13 sr20det with my stock heater core

Goldhawg · 02-03-2021, 09:47 AM

Quote:

Originally Posted by 5t341tH

I?ll look at my swap and see. Although mines s13 sr20det with my stock heater core

Appreciate it!

LoSt180 · 02-03-2021, 12:11 PM

You want the line coming off the head. It feeds the heater core then goes back around to the thermostat housing. Under the intake manifold, it's the hard pipe with a small one coming off of it, looks kinda like a Y.

The smaller hose off Y part goes to the thermostat housing also, so it can be a bit confusing if you're not following that coolant circuit diagram closely.

Goldhawg · 02-03-2021, 12:48 PM

Thanks so much....that was my initial read but I found the FSM confusing.

09-01-2020, 05:33 PM	#1
Goldhawg Join Date: Jan 2010 Location: Albquerque Posts: 22 Trader Rating: (0) Feedback Score: 0 reviews	SR20DE S15 coolant flow direction for heater valve? I have an SR20DE S15 I'm swapping into a Datsun Roadster and I'm not sure I'm reading the FSM correctly on coolant flow. I think the hot out of the engine is the tube closest to the block (the larger 90 deg 3/4" hose) but I wanted to be sure. I need to put the heater valve in and I want to be sure on the coolant flow out of the engine. Can anybody confirm which of the two lines coming out of the block/thermostat housing is the hot out? Thanks! PS, love to attach a pic but site won't let me (I am approved and file is only 222kb).

01-31-2021, 09:50 PM	#6
5t341tH Post Whore! Join Date: Jun 2006 Location: socal (Huntington Beach) Age: 33 Posts: 2,776 Trader Rating: (14) Feedback Score: 14 reviews	you talking about running into the heater core inside the car? If I remember right, it doesn't matter. On my datsun swap at least __________________ lexus baby

02-02-2021, 07:14 PM	#8
5t341tH Post Whore! Join Date: Jun 2006 Location: socal (Huntington Beach) Age: 33 Posts: 2,776 Trader Rating: (14) Feedback Score: 14 reviews	I've found this __________________ lexus baby

02-03-2021, 09:19 AM	#10
5t341tH Post Whore! Join Date: Jun 2006 Location: socal (Huntington Beach) Age: 33 Posts: 2,776 Trader Rating: (14) Feedback Score: 14 reviews	I’ll look at my swap and see. Although mines s13 sr20det with my stock heater core __________________ lexus baby

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09-01-2020, 06:45 PM	#2
S14rebuild BANNED Join Date: May 2019 Location: Florida-FAIL Posts: 2,497 Trader Rating: (8) Feedback Score: 8 reviews	Host images on imageshack or imgur Need pics to help

09-02-2020, 04:20 AM	#3
Goldhawg Join Date: Jan 2010 Location: Albquerque Posts: 22 Trader Rating: (0) Feedback Score: 0 reviews	Can you check out the picture on c/l I created (just to host the picture) dayton.craigslist.org/wan/d/spring-valley-wanted-silicone-heater/7188741153.html

09-02-2020, 05:27 AM	#4
S14rebuild BANNED Join Date: May 2019 Location: Florida-FAIL Posts: 2,497 Trader Rating: (8) Feedback Score: 8 reviews	https://www.google.com/search?sxsrf=...nlo8bygBwNFL5M Here u go

01-31-2021, 08:45 PM	#5
Goldhawg Join Date: Jan 2010 Location: Albquerque Posts: 22 Trader Rating: (0) Feedback Score: 0 reviews	Bump as I still don't have an answer on this. Anybody know which direction the coolant flow coming out of the block goes?

02-01-2021, 04:03 AM	#7
Goldhawg Join Date: Jan 2010 Location: Albquerque Posts: 22 Trader Rating: (0) Feedback Score: 0 reviews	Yes I am talking about the heater core. However, the valve that goes with my my aftermarket (Vintage Air) Evaporator/heater core has a direction to it for flow. So I want to mount the valve in the correct direction. I don't like only having a 50-50 chance of getting it right as it's kind of a pain to mount in my roadster (very little room) and I'd like not to have to go back in the future and take the intake all apart just to get down and reverse the valve so I can have heat.

02-02-2021, 08:30 PM	#9
Goldhawg Join Date: Jan 2010 Location: Albquerque Posts: 22 Trader Rating: (0) Feedback Score: 0 reviews	Thanks. But this is the FSM that I have, and its not clear to me how this matches my thermostat/block housing. See the picture of my setup here: https://www.facebook.com/photo/?fbid...88586861345626 My problem is the FSM shows the line closest to the block as going into the thermostat. But you can see on the facebook page that the line closest to the block is not going into the thermostat. This FSM picture just isn't clear to me.

02-03-2021, 12:11 PM	#12
LoSt180 Zilvia Addict Join Date: May 2013 Location: MD Posts: 966 Trader Rating: (18) Feedback Score: 18 reviews	You want the line coming off the head. It feeds the heater core then goes back around to the thermostat housing. Under the intake manifold, it's the hard pipe with a small one coming off of it, looks kinda like a Y. The smaller hose off Y part goes to the thermostat housing also, so it can be a bit confusing if you're not following that coolant circuit diagram closely.

02-03-2021, 12:48 PM	#13
Goldhawg Join Date: Jan 2010 Location: Albquerque Posts: 22 Trader Rating: (0) Feedback Score: 0 reviews	Thanks so much....that was my initial read but I found the FSM confusing.