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Old 11-21-2010, 07:02 PM   #1
Scooby Newbie
Member#: 246653
Join Date: May 2010
Chapter/Region: NESIC
Location: Manchester NH
2004 WRX

Default HELP. purging air out of radiator

2002 WRX. did a new radiator last week. cars running hot, just realized i didnt bleed the air. pulled the cap and started it, coolant is just flowing out of the overflow hose and all over everything. whats going on?
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Old 11-21-2010, 10:05 PM   #2
Jackie leggs
Scooby Specialist
Member#: 249794
Join Date: Jun 2010
Chapter/Region: MAIC
Location: Huntington, WV
02 WRX wagon
atomic orange pearl


ok to bleed the system of air, fill the tank up near the turbo till its full and "burp" the air out by squeezing the top radiator hose over and over. Keep doing this process till you can't fill any more in. Start the car for 30 seconds with the heat on high and the fan on high, this will pull the coolant back into the heater coil. turn off the car and fill the tank again plus more burping. Put the cap back on, start the car again and let it warm till near running temp, turn off and fill tank again and fill the overflow tank to the full line. This should get you all the fluid you can get into the cooling system. I then let it sit and cool over night and then checked it the next day to see where it was at and added if needed.
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Old 11-21-2010, 10:30 PM   #3
Scooby Specialist
Member#: 128115
Join Date: Oct 2006
Chapter/Region: South East
Location: Wilmington, NC
2004 4EAT Wagon PSM
enginuity is cool


Do all of the above and also remember not to open the cap on the radiator itself. Only add coolant through the reservoir above the turbo.
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Old 11-21-2010, 10:48 PM   #4
Scooby Newbie
Member#: 246653
Join Date: May 2010
Chapter/Region: NESIC
Location: Manchester NH
2004 WRX


there is no cap on the radiator...its by the turbo
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Old 11-22-2010, 02:29 AM   #5
Scooby Guru
Member#: 4414
Join Date: Feb 2001
Location: Dublin, CA
2002 WRX Sedan
Midnight Black


Here's how I do it:

Get a fairly large funnel. Make sure it fits in the tank snugly, round and smooth wall.
Start the car, put heat high, insert funnel.
Stand there holding the funnel until the car warms up and coolant starts to fill the funnel.
Hold the funnel and give the top hose a squeeze or two. If it doesn't rise enough, add a little coolant to get plenty of weight on the funnel, and it will hold itself and not leak.
Let it idle for around 10-15 more minutes. If this is in the garage, make sure the garage door is open.
Stick a small tube down the middle of the funnel. Start a siphon into the overflow tank.
Drain down to the top of the cap or just a tad higher and pull the funnel out. Wipe up what's left and put the cap on. Shut off the car and you're done.

Anytime I tried to shortcut the process, I'd get air in there. The dealer screwed up re-filling the coolant for me the only time they tried too. The Impreza is touchy about burping, just let it idle for a good while and the bubbles will work themselves out. Ensure the level in the funnel is well above the level in any of the little paths out the top of the reservoir near the turbo and keep the level to the top of the cap when you put the cap on so you don't get a bubble in one of those passages (which, I think is the most common source of air in the coolant system. It must be filled to the brim when burped and kept there until you put the cap on.)

You can get the same results by making a huge mess and just idling and letting it run everywhere, but it does make a huge mess, and your engine bay smells like burning coolant for a week. All you need to avoid the mess is a funnel and a small tube for the siphon.
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