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Old 02-20-2008, 11:11 AM   #1
Obsessive
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Default Air pocket in cooling system. Questions.

During my recent (Sunday) Stage2 upgrade (in which we had to remove the turbo to get the uppipe out... Motor-mount bolt rounded), I lost alot of coolant, as we removed the coolant banjo bolts from the turbo.

We refilled the coolant, but there must have been alot of air in the system, as I filled it (just upper reservoir and overflow), and it sucket both of them almost dry. I figured that out this AM, when I drove my car down the hill from my house, and it stopped blowing warm air out of the vents. I turned around and went back up the hill to my house (at which point it started blowing hot air-albiet on and off). I pulled into the garage, and popped (with a big towel) the radiator caps off. The upper reservoir was only down to 1/2 inch or so from the bottom, and the overflow was at the bottom as well. The temperature gauge has been coming up normally and not spiking upwards.

It's been VERY cold here (-4night to ~+15day), and I noticed one fan running when I got home last night when this happened. I assume the fan switch was exposed to air, not coolant. But, like I said, no weird operation, overheating symptoms, etc.

What I'm concerned about is the turbo because of the coolant loss in the upper reservoir. It's not squeeling, it's running good boost (I checked this AM, after refilling and purging). I know the oil will cool it somewhat, and due to the COLD temps, I'm sure that helps a bit.

Input?

E
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Old 02-20-2008, 12:37 PM   #2
02WRXTURBO
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u need to burp ur coolant system. Using the upper radiator hose keep squeezing it with the upper coolant tank cap off. U lost alot more coolant than u think. U will be suprised how much more coolant u can add when u do this.
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Old 02-20-2008, 11:20 PM   #3
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Don't squeeze your hose. Squeezing is reserved for parts of the human anatomy, not your car. Here is the proper way to do it:

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.) Start 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
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Old 02-21-2008, 12:12 AM   #4
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^ Good post, I was just gonna find that link.
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Old 02-21-2008, 02:06 AM   #5
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ya had the same problem, definitly takes a lot of coolant and a lot of checking to make sure its working properly, also make sure ALL air is out by releasing the cap, if you notice a "whooshing" sound when you press on the gas there is still a tad in there, if you run it hard enough it will heat up so watch out!
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Old 02-21-2008, 08:03 AM   #6
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Quote:
Originally Posted by eurospek View Post
^ Good post, I was just gonna find that link.
Yep, more or less that's exactly how it says to change the coolant in the manual too.
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Old 02-21-2008, 01:13 PM   #7
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why turn to defroster though?
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Old 02-21-2008, 03:45 PM   #8
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^ Opens the heater core to get the air out.
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Old 02-21-2008, 05:07 PM   #9
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Quote:
Originally Posted by Oldfart Racer View Post
^ Opens the heater core to get the air out.
hahahahaahahhahahaha do you seriously believe the bs that you just said??


coolant is ALWAYS flowing through the heater core.
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Old 02-21-2008, 06:25 PM   #10
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Quote:
Originally Posted by sidewayz View Post
hahahahaahahhahahaha do you seriously believe the bs that you just said??


coolant is ALWAYS flowing through the heater core.
Are you sure? I know on my 4Runner if the cabin heat was set to cold, the heater core would close. Could be different on Subies.....


FWIW - When I changed my turbo out, I had an overheating issue. When I burped the system, all I had to do was let the car run with the cap off and as the coolent went down I refilled it as needed. I've run the car very hard since then on multiple occasions and haven't had any overheating issues.
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Old 02-21-2008, 07:36 PM   #11
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Thanks, guys.

I followed the FAQ (whould have looked in the first place), and its happy now.

Eric
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Old 02-21-2008, 08:10 PM   #12
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Quote:
Originally Posted by ItalianGuy View Post
Are you sure? I know on my 4Runner if the cabin heat was set to cold, the heater core would close. Could be different on Subies.....
yeah. its not like that. Subaru's do not have a heater control valve
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Old 02-22-2008, 08:51 AM   #13
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a 3/8ths inch socket extension works a treat to plug those turbo coolant lines, btw.

and turbos do not NEED coolant flow to work properly and last a long time. it just helps preserve longevity for the boneheads who like to do a pull through 3 gears right before shutting the car off.
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