Trans fluid flow path

N97746 · 03-17-2022, 07:55 PM

Am about to plumb in a trans cooler in my +T. Can anybody give me the proper flow direction from the tranny through the rad and cooler then back to the trans. Want to be sure before I start bending pipes. Thanks

hiperfauto · 03-17-2022, 10:24 PM

http://hiperformanceautoservice.com/...7xFlowPath.jpg

N97746 · 03-18-2022, 09:43 AM

Thanks, That confirms that the forward line from the tranny is the outflow. I was unsure if the fluid should route to the air cooler first and then back through the radiator cooler then to trans, or the other way around. I've seen diagrams of it both ways. Some sites even recommend bypassing the radiator cooler completely when using an air cooler.

dalek · 03-22-2022, 05:56 AM

AFAIK, the tranny fluid needs to be at a certain temperature range, so the radiator does the job of warming it up but then keeping it at a given temperature. If using an external tranny cooler, I wonder if you would be happier with adding it after the radiator but then with a thermostat so it can be bypassed until it is too hot.

N97746 · 03-24-2022, 09:12 AM

That's sort of the direction I was going to go with. Trans to cooler, back to radiator then returning to trans. But I have seen the opposite done on other sites.
I was hoping someone with a stock 7/9 turbo would chime in to see how Volvo did it on the stock cars.

dalek · 03-25-2022, 07:56 AM

I have never posted a single useful post in this site, and would like to keep my record, but I think the lower drawing in

stolen from https://usparts.volvocars.com/p/Volv...9/1378185.html, might give you ideas. Incidentally, my own car, which supposedly is a turbo from factory, does not have the fancy tiny cooler.

N97746 · 03-26-2022, 04:19 PM

Dalek, Thanks for taking the time to look that up. If I'm reading it right seems that the fluid goes first to the radiator then to the cooler before returning. Funny, I thought it might be the other way around so that the tranny would have more of a constant temp fluid being returned. Guess Volvo knows best.

03-17-2022, 07:55 PM	#1
N97746 Board Member Join Date: Jan 2019 Location: Northeast PA.	Trans fluid flow path Am about to plumb in a trans cooler in my +T. Can anybody give me the proper flow direction from the tranny through the rad and cooler then back to the trans. Want to be sure before I start bending pipes. Thanks

03-17-2022, 10:24 PM	#2
hiperfauto The Librarian Join Date: Nov 2011 Location: So Cal	http://hiperformanceautoservice.com/...7xFlowPath.jpg __________________ 240 Alcantara Shift Boot Cover (164 & 72- 140 too) Rare, Race & R-Sports Parts Colored B/S Brake Hoses 140/160 and more Volvo Advertising Stuff -

03-22-2022, 05:56 AM	#4
dalek Benchracer Tribe Join Date: Oct 2005 Location: Orange Alert, NC	AFAIK, the tranny fluid needs to be at a certain temperature range, so the radiator does the job of warming it up but then keeping it at a given temperature. If using an external tranny cooler, I wonder if you would be happier with adding it after the radiator but then with a thermostat so it can be bypassed until it is too hot. __________________ "you can't leave your thingy hanging in public... you can get arrested." "What's Arkansas supposed to be, Kansas for pirates?" Forg "I think I can touch the tire. Damn! I can touch the tire! That hurts!" 240Psycho (on the back seat of my 94 Jetta while I was driving to a J/Y) "Use the barbed adapter like what I use to inflate the air camping mattresses and my dates." FTF Engineering i am inspired. i will replace my windsheild... with an intercooler.swedishK Feedback!

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

03-18-2022, 09:43 AM	#3
N97746 Board Member Join Date: Jan 2019 Location: Northeast PA.	Thanks, That confirms that the forward line from the tranny is the outflow. I was unsure if the fluid should route to the air cooler first and then back through the radiator cooler then to trans, or the other way around. I've seen diagrams of it both ways. Some sites even recommend bypassing the radiator cooler completely when using an air cooler.

03-24-2022, 09:12 AM	#5
N97746 Board Member Join Date: Jan 2019 Location: Northeast PA.	That's sort of the direction I was going to go with. Trans to cooler, back to radiator then returning to trans. But I have seen the opposite done on other sites. I was hoping someone with a stock 7/9 turbo would chime in to see how Volvo did it on the stock cars.

03-25-2022, 07:56 AM	#6
dalek Benchracer Tribe Join Date: Oct 2005 Location: Orange Alert, NC	I have never posted a single useful post in this site, and would like to keep my record, but I think the lower drawing in stolen from https://usparts.volvocars.com/p/Volv...9/1378185.html, might give you ideas. Incidentally, my own car, which supposedly is a turbo from factory, does not have the fancy tiny cooler.

03-26-2022, 04:19 PM	#7
N97746 Board Member Join Date: Jan 2019 Location: Northeast PA.	Dalek, Thanks for taking the time to look that up. If I'm reading it right seems that the fluid goes first to the radiator then to the cooler before returning. Funny, I thought it might be the other way around so that the tranny would have more of a constant temp fluid being returned. Guess Volvo knows best.