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Old 10-15-2007, 03:18 AM   #1
Scooby Specialist
Member#: 30185
Join Date: Nov 2002
Location: Antioch, California
2003 320 whp
on a heatbreaker dyno

Default Overheating

I'm overheating regularly. No leaks, no milky oil, no oily water.

But I lose about 2 qts when i drive 50 miles, not likely to overheat for at least 30 mins of driving or more. then the needle will start to rise up, go all the way to the top and sometimes come back down on it's own and sometimes stay up there - in which case I stop, refill with water....etc.

Coolent system is pressurized - may have air in it, but I'm losing so much water...I just don't know where. I don't see puddles and stains on my driveway. Wondering if it can be lost through the turbo or if it is a HG leak (I expected oil in the water if that is the case and not to lose so much water).

Obeservation: The overflow tank is nearly full but the engine fill tank is down at least 10 oz. No boiling into the overflow tank.

The only thing I can think of is that perhaps the water pump is leaking, cracked casing etc.

Ideas anyone?
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Old 10-15-2007, 07:52 AM   #2
Scooby Specialist
Member#: 14141
Join Date: Jan 2002
Location: 13.239@102.85 @ 5800 ft on 13T
2002 Impreza WRX


Burp the air out of the system (several times) and the problem will likely go away.

You probably have huge bubbles captured in the cooling system by now so it will take a concerted effort to get it all out.

Your symptoms exactly discribe what happens on a subie when it has air in the system.
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Old 10-15-2007, 07:55 AM   #3
Scooby Specialist
Member#: 84181
Join Date: Mar 2005
Chapter/Region: NESIC
Location: CT
NASA #530 GTS2


Just out of curiosity... Are your radiator fans coming on? I had an incident which lead to me blowing both radiator fan fuses which caused a "hot" condition. I just replaced them and poof all gone!

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