02 WRX Vacuum/Coolant Hose Install Guide - Page 4

Valarius Starchaser · 07-23-2019, 11:21 AM

Quote:

Originally Posted by 02WRX84

Great write up man! Great stuff! Where does the hose just below the IACV and to the right of it go?

I’m looking around and notice that there isn’t a hose connected there or on the throttle body under the inter cooler. I’m thinking the hose popped off and that they should have a hose connected to each other. What do you guys think?

That’s a coolant line

A lot of guys remove it never understood why no matter what climate your in what the gain is to doing it

To my recollection it’s a cold start/emissions type system

* Registered users of the site do not see these ads.

Mountain Trek · 08-03-2019, 08:46 PM

Would this be the same setup for a 2.5XT Forester 2004 , or is there any significant difference to the sizes and lengths of hose needed? I had several crumble when getting the heads off.

not12listen · 08-14-2019, 10:15 PM

Great write up! Been using their hoses for years - with rare exception - I wouldn't use anything else.

Hose D and G - those I had issue with. Those are for the transport of oil vapors (PCV) and oil isn't friendly (in my experience) with those hoses. Hose D in specific sheered off - it look like someone cut it STRAIGHT at the top end of the breather of the head itself - the heat, bend + less than friendly oil vapors.

Absolutely everywhere else, no issues.

I've also run their hoses in other vehicles like both of my wife's (1 wife, 2 cars) Outbacks and my 1986 Mr2 - stellar results in all 3 vehicles!

----

I've heard of a magical coolant hose that runs UNDER the throttle body (2006 WRX in my case). Just curious if I missed something, as I cannot find it on your WRX.

Thanks!

Bdufala · 12-06-2019, 04:18 PM

I just installed a new radiator and am having issues with HOSE H. It is the factory hose so I plan on replacing it but the hose itself seems barely to big compared to being snug on my old radiator. HOSE I is slightly smaller (at least on my car) and seems like I need that same size on HOSE I.
Sorry if that is confusing or if I am on the wrong thread. Thanks

SIMPFLY · 01-16-2020, 06:47 PM

pic of heater hvac hoses below

part nos are 72411fe001 and 72421fe010

benders · 01-20-2020, 10:42 PM

Quote:

Originally Posted by Valarius Starchaser

That’s a coolant line

A lot of guys remove it never understood why no matter what climate your in what the gain is to doing it

To my recollection it’s a cold start/emissions type system

I believe it's also to prevent the throttle from icing up in cold. Otherwise the pressure/temperature drop after the throttle plate could form ice and a sticking throttle.

evo_nahh · 04-20-2020, 03:53 AM

How are you guys clamping the hoses?

PDXBugGuy · 07-06-2020, 06:49 PM

Lets goooo, was hoping to find a thread like this. Crazy what the search feature can do

bodhicheetah · 11-30-2020, 12:04 AM

In the process of doing this right now. Was having a hell of a time following the write up and the pictures because my internet is slow as hell.

Took the liberty of creating a google doc with all the pictures in line with the text.

All credit goes to freeman.matt for the excellent original write up and pictures!

All I did was put it on the same page. Hope it helps someone out there.

https://docs.google.com/document/d/1...JpYelkEcw/edit

Btw, it seems HPSI-Motorsports has run out of or discontinued their Subaru hose kit? Can't find it on their site anymore. I ordered mine months ago, luckily I guess...

Goodhand · 01-27-2021, 08:56 AM

Quote:

Originally Posted by SIMPFLY

pic of heater hvac hoses below

part nos are 72411fe001 and 72421fe010

Has anyone replaced these with non-oem hoses with success? Mine need replacing and my local subaru dealer is seriously slow.

Treevis · 02-11-2021, 04:55 PM

Awesome thread thank you!

KP213 · 07-18-2021, 12:28 AM

Hey does anyone have the pictures to this thread?? I saved this post because I have on 02 wagon that has a vacuum leak and this thread was the perfect run down on how to do the project. For whatever reason, now when I try to open the pictures and it says the server cannot be found. If anyone has the pictures or can help me out, please let me know. I know this thread is old but I figured I'd try!

Thanks,
Kyle

______________________________________

HOLD UP. I just realized that someones got a post a few comments up with the pictures and everything. FALSE ALARM. (I was going to just delete my post but couldn't figure out how.)

All is good. Thanks freeman.matt for the perfect post and write up, and thank you bodhicheetah for having it reposted.
Cheers!

willyabts · 12-28-2022, 06:29 PM

i need a diagram for my 03 wrx it was a basket case and i can find nothing any help would be appreiated

Elbert Bass · 12-30-2022, 12:08 PM

Best of my knowledge there is no single source diagram. When I first went to work for Subaru and would get a "box" engine/car I used the images in the FSM in the Description pages for Fuel Injection & Engine Mechanical. Also images in the Subaru parts catalog.

You can purchase a short-term subscription to STIS (to download the FSM) at https://techinfo.subaru.com/stis/#/p...e_subscription
and the parts catalog is here https://parts.subaru.com/

feliz · 02-13-2025, 03:54 PM

couple year tread bump. thank you. this was crucial to getting mine back together after a year of scattering parts...

12-06-2019, 04:18 PM	#79
Bdufala Scooby Newbie Member#: 457779 Join Date: Nov 2016	I just installed a new radiator and am having issues with HOSE H. It is the factory hose so I plan on replacing it but the hose itself seems barely to big compared to being snug on my old radiator. HOSE I is slightly smaller (at least on my car) and seems like I need that same size on HOSE I. Sorry if that is confusing or if I am on the wrong thread. Thanks Last edited by Bdufala; 12-06-2019 at 10:59 PM. Reason: I figured it out

07-18-2021, 12:28 AM	#87
KP213 Scooby Newbie Member#: 518950 Join Date: Sep 2020	Help Hey does anyone have the pictures to this thread?? I saved this post because I have on 02 wagon that has a vacuum leak and this thread was the perfect run down on how to do the project. For whatever reason, now when I try to open the pictures and it says the server cannot be found. If anyone has the pictures or can help me out, please let me know. I know this thread is old but I figured I'd try! Thanks, Kyle ______________________________________ HOLD UP. I just realized that someones got a post a few comments up with the pictures and everything. FALSE ALARM. (I was going to just delete my post but couldn't figure out how.) All is good. Thanks freeman.matt for the perfect post and write up, and thank you bodhicheetah for having it reposted. Cheers! Last edited by KP213; 07-18-2021 at 12:38 AM.

12-28-2022, 06:29 PM	#88
willyabts Scooby Newbie Member#: 532651 Join Date: Dec 2022	03 wrx vacuum diagram i need a diagram for my 03 wrx it was a basket case and i can find nothing any help would be appreiated

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

08-03-2019, 08:46 PM	#77
Mountain Trek Scooby Newbie Member#: 441288 Join Date: Feb 2016 Vehicle: 2004 Forester 2.5XT Red	Would this be the same setup for a 2.5XT Forester 2004 , or is there any significant difference to the sizes and lengths of hose needed? I had several crumble when getting the heads off.

08-14-2019, 10:15 PM	#78
not12listen Scooby Newbie Member#: 147078 Join Date: Apr 2007 Chapter/Region: BAIC Location: sf bay area, ca Vehicle: 2006 WRX Wagon Grey	Great write up! Been using their hoses for years - with rare exception - I wouldn't use anything else. Hose D and G - those I had issue with. Those are for the transport of oil vapors (PCV) and oil isn't friendly (in my experience) with those hoses. Hose D in specific sheered off - it look like someone cut it STRAIGHT at the top end of the breather of the head itself - the heat, bend + less than friendly oil vapors. Absolutely everywhere else, no issues. I've also run their hoses in other vehicles like both of my wife's (1 wife, 2 cars) Outbacks and my 1986 Mr2 - stellar results in all 3 vehicles! ---- I've heard of a magical coolant hose that runs UNDER the throttle body (2006 WRX in my case). Just curious if I missed something, as I cannot find it on your WRX. Thanks!

01-16-2020, 06:47 PM	#80
SIMPFLY Scooby Specialist Member#: 54794 Join Date: Feb 2004 Location: Bay Area Vehicle: 2004 WRX in the Barn 2018 Porsche 911	pic of heater hvac hoses below part nos are 72411fe001 and 72421fe010

04-20-2020, 03:53 AM	#82
evo_nahh Scooby Newbie Member#: 492988 Join Date: Oct 2018	How are you guys clamping the hoses?

07-06-2020, 06:49 PM	#83
PDXBugGuy Scooby Newbie Member#: 504109 Join Date: Jul 2019 Chapter/Region: NWIC Vehicle: 2002 WRX 01G	Lets goooo, was hoping to find a thread like this. Crazy what the search feature can do

11-30-2020, 12:04 AM	#84
bodhicheetah Scooby Newbie Member#: 398045 Join Date: Aug 2014 Chapter/Region: RMIC Location: Colorado Vehicle: 2004 Impreza WRX	In the process of doing this right now. Was having a hell of a time following the write up and the pictures because my internet is slow as hell. Took the liberty of creating a google doc with all the pictures in line with the text. All credit goes to freeman.matt for the excellent original write up and pictures! All I did was put it on the same page. Hope it helps someone out there. https://docs.google.com/document/d/1...JpYelkEcw/edit Btw, it seems HPSI-Motorsports has run out of or discontinued their Subaru hose kit? Can't find it on their site anymore. I ordered mine months ago, luckily I guess...

02-11-2021, 04:55 PM	#86
Treevis Scooby Newbie Member#: 522274 Join Date: Feb 2021 Vehicle: 2003 Sonic Yellow	Awesome thread thank you!

12-30-2022, 12:08 PM	#89
Elbert Bass Scooby Specialist Member#: 283429 Join Date: May 2011 Chapter/Region: South East Location: Down yonder. Vehicle: 2016 Crosstrek Silver	Best of my knowledge there is no single source diagram. When I first went to work for Subaru and would get a "box" engine/car I used the images in the FSM in the Description pages for Fuel Injection & Engine Mechanical. Also images in the Subaru parts catalog. You can purchase a short-term subscription to STIS (to download the FSM) at https://techinfo.subaru.com/stis/#/p...e_subscription and the parts catalog is here https://parts.subaru.com/

02-13-2025, 03:54 PM	#90
feliz Scooby Newbie Member#: 517506 Join Date: Aug 2020 Chapter/Region: MAIC Location: south jersey Vehicle: 97 coupe-bugeyewrx	couple year tread bump. thank you. this was crucial to getting mine back together after a year of scattering parts...