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Old 10-09-2012, 11:01 AM   #4
Scooby Specialist
Member#: 265430
Join Date: Nov 2010
Chapter/Region: MWSOC
Location: Cleveland
2005 OBP WRX STi
IG/FB - seriousblacksti


Originally Posted by UK-Wagon View Post
Change thermostat, and both radiator caps. The car is 7 years old, time to replace those. If the HGs lifted you wouldnt have made it home, period!
Originally Posted by fastblueufo View Post
True this. I just lifted one and was spitting coolant out the exhaust after fixing a coolant hose that popped with 25 psi boost pressure going into the coolant system
That's what I was thinking. When I got home I did some research on what could cause the problem I was having and I saw quite a few threads pointing towards lifting heads, but that's not something that would happen and just go away.

I'm definitely going to replace the thermostat and both caps, I'm also thinking of flushing the cooling system again and making sure that none of the small hoses and lines are clogged. I wish there was a more "scientific" way to check to see when the problem starts happening rather than taking the car out and running the piss out of it, but I don't have access to an AWD dyno or anything like that so I'm stuck with what roads.

I suppose it is possible that I over-taxed my cooling system and boiled coolant. We were on these roads for at least an hour at a time and we might have averaged 30-35MPH. Basically it was WOT in 2nd or 3rd, on to the brakes, into a corner, and repeat. Maybe there wasn't enough air moving though the radiator to keep things cool and the coolant boiled, then with the pressure in the system from that it forced coolant out making the problem worse. It sounds exactly like what I've read about lifts heads on these cars to me though. I never over-revved the car but it was between 3000 and 6800 RPMs basically the whole time. I'm almost positive that both fans are working (I know they both kick on if I turn the a/c on) but maybe a relay was acting up and the fans weren't working properly either or something.
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