Welcome to the North American Subaru Impreza Owners Club Saturday May 30, 2020
Home Forums Images WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC Technical > Built Motor Discussion

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.







* As an Amazon Associate I earn from qualifying purchases. 
* Registered users of the site do not see these ads. 
Reply
 
Thread Tools Display Modes
Old 02-15-2007, 11:41 PM   #1
dukeduster
Scooby Specialist
 
Member#: 95789
Join Date: Sep 2005
Location: Lovington nm
Vehicle:
2002 WRX PTE
6262, hydra, 1100 FIC

Default cooling system questions

I have a bit of a problem I would like to get rid of. I have the 2.5L block in my wrx with a stock wrx radiator. Here lately the car started to overheat. I can rev the engine and it will get hotter but at idle itll stay somewhat cooler. I tried to pump the top hose to get air out and its filled with air and pressurized. so it make it kinda hard to bleed. I will let it idle from cold to hot with the cap off the filler tank and it will start to overflow a lot once it has warmed up. I am not sure whats going on here anyone have any insight?
* Registered users of the site do not see these ads.
dukeduster is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 02-16-2007, 12:08 AM   #2
reddevil
Scooby Guru
 
Member#: 64673
Join Date: Jun 2004
Chapter/Region: NWIC
Location: portland
Vehicle:
1990 Legacy wagon
goes 12.387 @ 116.5

Default

Take off the radiator cap when it gets hot and overflows. Carefully of course.

Is it bubbling? If so, blown HG.
reddevil is offline   Reply With Quote
Old 02-16-2007, 12:11 AM   #3
dukeduster
Scooby Specialist
 
Member#: 95789
Join Date: Sep 2005
Location: Lovington nm
Vehicle:
2002 WRX PTE
6262, hydra, 1100 FIC

Default

no its not bubbling at all. so your saying taker the filler cap off when its hot while the car is running?
dukeduster is offline   Reply With Quote
Old 02-16-2007, 12:19 AM   #4
dukeduster
Scooby Specialist
 
Member#: 95789
Join Date: Sep 2005
Location: Lovington nm
Vehicle:
2002 WRX PTE
6262, hydra, 1100 FIC

Default

it overflows with the cap off is what i wrote. i left it off for like 10 seconds overflowing before i put it back on.
dukeduster is offline   Reply With Quote
Old 02-16-2007, 12:29 AM   #5
dukeduster
Scooby Specialist
 
Member#: 95789
Join Date: Sep 2005
Location: Lovington nm
Vehicle:
2002 WRX PTE
6262, hydra, 1100 FIC

Default

oh and radiator does not have a cap. Do you mean filler tank cap?
dukeduster is offline   Reply With Quote
Old 02-16-2007, 01:50 PM   #6
dukeduster
Scooby Specialist
 
Member#: 95789
Join Date: Sep 2005
Location: Lovington nm
Vehicle:
2002 WRX PTE
6262, hydra, 1100 FIC

Default

well I Went outside this morning and cranked the car up with the cap off the filler tank. I squeezed the upper hose while warming up and it started to overflow not much air came out. The car warmed up but the heater didnt warm up nor did the radiator hoses. Does anyone think it could be the thermostat? or just air in the system?
dukeduster is offline   Reply With Quote
Old 02-16-2007, 04:20 PM   #7
dukeduster
Scooby Specialist
 
Member#: 95789
Join Date: Sep 2005
Location: Lovington nm
Vehicle:
2002 WRX PTE
6262, hydra, 1100 FIC

Default

I drained the fluid and it didnt seem to be very much in there at all. I checked for a gassy smell or any other signs of a blown HG and everything seems A-OK. Tested the thermostat and it opened right on que. I think its air in the system
dukeduster is offline   Reply With Quote
Old 02-16-2007, 04:40 PM   #8
dukeduster
Scooby Specialist
 
Member#: 95789
Join Date: Sep 2005
Location: Lovington nm
Vehicle:
2002 WRX PTE
6262, hydra, 1100 FIC

Default

i got 2.6ish litres back from the radiator when i drained it.
dukeduster is offline   Reply With Quote
Old 02-16-2007, 06:14 PM   #9
dukeduster
Scooby Specialist
 
Member#: 95789
Join Date: Sep 2005
Location: Lovington nm
Vehicle:
2002 WRX PTE
6262, hydra, 1100 FIC

Default

Ok I got the problem fixed. Just drained it all and filled it again and presto! no more overheating.
dukeduster is offline   Reply With Quote
Old 02-16-2007, 06:40 PM   #10
dibblejr
Scooby Guru
 
Member#: 94070
Join Date: Aug 2005
Chapter/Region: South East
Location: Dirty South
Vehicle:
05 LGT
PSM

Default

OP- ensure you did your coolant fill by the book or you will overheat. There is only one way to burp the system and squeezing the radiator hose and opening up the radiator cap is not the propper way. LMK if you dont find the proceedure in your owners manual and I will wrrite it here. It is easy.

Jay-R
dibblejr is offline   Reply With Quote
Old 02-16-2007, 08:02 PM   #11
dukeduster
Scooby Specialist
 
Member#: 95789
Join Date: Sep 2005
Location: Lovington nm
Vehicle:
2002 WRX PTE
6262, hydra, 1100 FIC

Default

If you could write it here that would be nice for future refernce of all other who need the do it the proper way. I fixed my problem by draining the radiator taking the thermostat out and test it in boiling water. re installed the thermostat and then took off the upper radiator hose off the radiator side and filled with anti freeze. The I switched sides and took it off the engine side and filled the radiator up. after this i filled the fill tank up and connected everything back and it went perfect.
dukeduster is offline   Reply With Quote
Old 02-16-2007, 08:24 PM   #12
dibblejr
Scooby Guru
 
Member#: 94070
Join Date: Aug 2005
Chapter/Region: South East
Location: Dirty South
Vehicle:
05 LGT
PSM

Default

How to PROPERLY BURP your cooing system
These instructions can be found in your Subaru Owners Manual

What you will need:
1) Coolant 50/50 Pre-mix
2) Old towel or rag
3) Time
4) More Time

At no time does this say to open the radiator cap, doing so will compromise the burping of the coolant system

1.) Check Fluid level in both the Radiator Resevoir and the Turbo Coolant Res ( Metal tank over the TI)
2.) Fill Radiator Resevoir to the full line
3.) Top off the Turbo Resevoir
4.) Replace Caps
5.) Place car in "N"
6.) Strat car and turn on Defroster to High and Heat
7.) Hold RPM's to 3000 for 10 minutes (do not worry if Temp Gauge Rises)
8.) Turn car off to "ACC" until "C" cool
9.) Use the towel to carefully open the Turbo Coolant Resevoir
10.) Top off Turbo Resevoir
11.) Fill the Radiator Coolant Resevoir to the Full Line
12.) Replace caps
13.) Repeat steps 1-12 until no further coolant is added to either tanks.

** This proceedure will take you approx 50 minutes after a Turbo upgrade
This proceedure will take you longer than you think with just a small am mount of coolant loss.
Do not open the radiator unless you have just removed all fluids from your car. If that is the case fill radiator to the top and replace cap and follow the rest of the instructions.
** On 03's and older there is no radiator cap so you will have to fill the radiator during a complete cooland change via the top radiator hose. Just get as much as you can in and then follow the steps above.

*** Nowhere does it say to squeeze the radiator hose, use a funnell in the radiator filler hole, put air into the coolant resevoir, squeeze and watch the coolant rise as the T-stat opens or any of the other shade tree mechanic techniques.
This is by the book, any other steps incorporated can be dangerous to you and or damage the car.

Jay-R

Last edited by dibblejr; 02-16-2007 at 08:34 PM.
dibblejr is offline   Reply With Quote
Old 02-16-2007, 09:30 PM   #13
intercoolerontop
Scooby Specialist
 
Member#: 72148
Join Date: Oct 2004
Chapter/Region: SWIC
Location: PHX, AZ
Vehicle:
2010 Ford Raptor
RAWR

Default

^^^^ good stuff, i have a built motor and a fmic with a stock wrx radiator in AZ. Do these steps and u should have any problems
intercoolerontop is offline   Reply With Quote
Old 07-15-2007, 02:01 AM   #14
ejicon
Scooby Guru
 
Member#: 2452
Join Date: Sep 2000
Chapter/Region: SCIC
Location: Burbank,California, USA
Vehicle:
08 2.5 WRX
WRB Mica

Default

I don't have my 2002 2.5 RS owners manual. Anyone know where I can find this same info for my car? Thanks

-Ellz
ejicon is offline   Reply With Quote
Old 07-15-2007, 07:43 AM   #15
dibblejr
Scooby Guru
 
Member#: 94070
Join Date: Aug 2005
Chapter/Region: South East
Location: Dirty South
Vehicle:
05 LGT
PSM

Default

On non turbo cars it is much easier. If your car has a radiator cap just fill the radiator up as far as you can get by the top hose. Put the top hase back on and tighten. Fill the coolant resevoir up and use the same process with the RPM's. After the engine cools add more coolant to the resevoir and repeat. Shouldnt take that long for your car.

If it has a radiator cap just remove and fill the radiator, fill the coolant resevoir to the full line and you should be able to drive the car. Check the coolant resevoir for coolant after you drive around town, once you dont have to add anymore then your car is ready for a long trip.

I dont have a book on your car, but non turbo cars have less room for air pockets and the same practice can be used on all non turbo cars.

Hope this helped.

Jay-R

Quote:
Originally Posted by ejicon View Post
I don't have my 2002 2.5 RS owners manual. Anyone know where I can find this same info for my car? Thanks

-Ellz
dibblejr is offline   Reply With Quote
Old 07-15-2007, 08:53 AM   #16
jaxscuby
Sammo Hung
Moderator
 
Member#: 10613
Join Date: Sep 2001
Chapter/Region: South East
Location: GTMO / S Ga / N Fla
Vehicle:
2002 USDM WRX
WRB

Default

redline water wetter also helps
jaxscuby is offline   Reply With Quote
Old 07-15-2007, 10:44 AM   #17
Patrick Olsen
Scooby Guru
 
Member#: 120
Join Date: Jul 1999
Chapter/Region: AKIC
Location: Where the Navy sends me...
Vehicle:
1997 Legacy 2.5GT
1996 Impreza coupe

Default

Quote:
Originally Posted by dibblejr View Post
I dont have a book on your car, but non turbo cars have less room for air pockets and the same practice can be used on all non turbo cars.
How do non-turbo cars have less room for air pockets? I thought the cooling system layout was very similar.

Pat Olsen
Patrick Olsen is offline   Reply With Quote
Old 11-17-2007, 04:06 PM   #18
lisa6104
Scooby Newbie
 
Member#: 164548
Join Date: Nov 2007
Default

Quote:
Originally Posted by dibblejr View Post
How to PROPERLY BURP your cooing system
These instructions can be found in your Subaru Owners Manual

What you will need:
1) Coolant 50/50 Pre-mix
2) Old towel or rag
3) Time
4) More Time

At no time does this say to open the radiator cap, doing so will compromise the burping of the coolant system

1.) Check Fluid level in both the Radiator Resevoir and the Turbo Coolant Res ( Metal tank over the TI)
2.) Fill Radiator Resevoir to the full line
3.) Top off the Turbo Resevoir
4.) Replace Caps
5.) Place car in "N"
6.) Strat car and turn on Defroster to High and Heat
7.) Hold RPM's to 3000 for 10 minutes (do not worry if Temp Gauge Rises)
8.) Turn car off to "ACC" until "C" cool
9.) Use the towel to carefully open the Turbo Coolant Resevoir
10.) Top off Turbo Resevoir
11.) Fill the Radiator Coolant Resevoir to the Full Line
12.) Replace caps
13.) Repeat steps 1-12 until no further coolant is added to either tanks.

** This proceedure will take you approx 50 minutes after a Turbo upgrade
This proceedure will take you longer than you think with just a small am mount of coolant loss.
Do not open the radiator unless you have just removed all fluids from your car. If that is the case fill radiator to the top and replace cap and follow the rest of the instructions.
** On 03's and older there is no radiator cap so you will have to fill the radiator during a complete cooland change via the top radiator hose. Just get as much as you can in and then follow the steps above.

*** Nowhere does it say to squeeze the radiator hose, use a funnell in the radiator filler hole, put air into the coolant resevoir, squeeze and watch the coolant rise as the T-stat opens or any of the other shade tree mechanic techniques.
This is by the book, any other steps incorporated can be dangerous to you and or damage the car.

Jay-R
Where is the Turbo Coolant Reservior and how do I know if my subaru has one? We have been trying for 2 days now to get the system to "burp". We try, go down the road and it starts overheating again and the heat will come on and off while it's doing this. Please help, this is my only transporation.
lisa6104 is offline   Reply With Quote
Old 11-17-2007, 04:16 PM   #19
dibblejr
Scooby Guru
 
Member#: 94070
Join Date: Aug 2005
Chapter/Region: South East
Location: Dirty South
Vehicle:
05 LGT
PSM

Default

^^Lisa - What year and model Suby? Normally the resevoir is a clear plastic tank on the drivers side oe the radiator. It will say place coolant here, coolant. It also has a Full and add line on it. Maybe yellow cap.

I take it you did not follow my directions to the "t".

You were not suppossed to operate the car until the burping was complete. As stated above it can take 45 min to several hours depending on the car.

If its your only mode of transportation, you would not drive it until the burping is complete. I never say drive it to see if it is burped. You will know by following the above proceedures correctly.

Note- if you continue to drive your car to do the process severe damage to your motor can occurr.

Jay-R

Last edited by dibblejr; 11-17-2007 at 04:26 PM.
dibblejr is offline   Reply With Quote
Old 11-17-2007, 04:18 PM   #20
dibblejr
Scooby Guru
 
Member#: 94070
Join Date: Aug 2005
Chapter/Region: South East
Location: Dirty South
Vehicle:
05 LGT
PSM

Default

I am speaking for Subarus only. A non turbo'd suby does not have the turbo coolant resevoir, therefore one less place to bleed the air from.

Similar yes, but not the same.

Sorry for the lare reply, just received the message today.

Jay-R

Quote:
Originally Posted by Patrick Olsen View Post
How do non-turbo cars have less room for air pockets? I thought the cooling system layout was very similar.

Pat Olsen
dibblejr is offline   Reply With Quote
Old 11-21-2007, 06:40 PM   #21
Jpizzzle
Scooby Specialist
 
Member#: 95492
Join Date: Sep 2005
Chapter/Region: MWSOC
Location: Waterford, MI
Vehicle:
2003 WRX with STI
goodies >:)

Default

I was told the 2.5 block needs a larger radiator than the stock WRX. can anyone verify this or tell me different? sounds like other people are using stock radiators with hybrids so now i am confused.

Jon
Jpizzzle is offline   Reply With Quote
Old 11-21-2007, 07:00 PM   #22
dibblejr
Scooby Guru
 
Member#: 94070
Join Date: Aug 2005
Chapter/Region: South East
Location: Dirty South
Vehicle:
05 LGT
PSM

Default

Whoever told you that is confused. I ran my first hybrid 3.5 years until spun #3 rod bearing. I am now on my 2nd hybrid this time even bigger on OEM radiator. Dont change a thing unless you have a few hundred extra around. Also do not use the HP radiator cap.

My h2o temp has always been just under 1/2.

Jay-R

Quote:
Originally Posted by Jpizzzle View Post
I was told the 2.5 block needs a larger radiator than the stock WRX. can anyone verify this or tell me different? sounds like other people are using stock radiators with hybrids so now i am confused.

Jon
dibblejr is offline   Reply With Quote
Old 11-21-2007, 07:15 PM   #23
paintbing
Scooby Specialist
 
Member#: 59388
Join Date: Apr 2004
Chapter/Region: RMIC
Location: Utah --> Monterey, CA
Vehicle:
2003 WRX - Hybrid
I do my own stunts

Default

Proper burping FTW! You wouldn't let your infant go to sleep unless they were burped... right?
paintbing is offline   Reply With Quote
Old 11-21-2007, 07:19 PM   #24
Patrick Olsen
Scooby Guru
 
Member#: 120
Join Date: Jul 1999
Chapter/Region: AKIC
Location: Where the Navy sends me...
Vehicle:
1997 Legacy 2.5GT
1996 Impreza coupe

Default

Quote:
Originally Posted by dibblejr View Post
Also do not use the HP radiator cap.
Horsepower radiator cap? Hewlett Packard?
Patrick Olsen is offline   Reply With Quote
Old 11-21-2007, 08:01 PM   #25
186
*** Banned ***
 
Member#: 159868
Join Date: Sep 2007
Default

Subies are hard to burp. I had the same problem after some mods to my hybrid 2.5. It would not burp at idle. It seemed topped off.
Then I took it out on the road and it would get hot.

I ended up buying 4 gals of coolant / some mits / many big rags. Then took off. Every time the car started to heat a bit I pulled over with my armoured self - took the cap off and added coolant. I did this 3-4 times before I finally got all the air out.

As said before, do not attempt this unless you have the means to remove the hot cap and have plenty of coolant on hand. Engine failure will result.
I was amazed at how much coolant I put in after the mechanic said the car was topped off.

Good luck
186 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Cooling system question Alex_WRX Service & Maintenance 2 06-23-2006 11:56 AM
Heating/Cooling System Question WRXBlueBallz Off-Topic 8 03-08-2006 06:35 PM
Swap underway-cooling system question rickG888 Subaru Conversions 9 09-23-2003 11:56 AM
cooling system questions??? donut Normally Aspirated Powertrain 24 10-09-2001 01:01 PM
Cooling System Question Spectre23 Normally Aspirated Powertrain 5 02-11-2001 08:55 PM

All times are GMT -4. The time now is 10:46 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2020 Axivo Inc.
Copyright ©1999 - 2019, North American Subaru Impreza Owners Club, Inc.

As an Amazon Associate I earn from qualifying purchases.