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Old 12-30-2008, 01:15 AM   #1
2.5impreza
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Default Overheating issue...only highway speeds

Just bought an 05 Impreza 2.5RS and brought it out on a ski trip. Going down the highway at approx 120 kph or 80-90 mph. I noticed that my temp was above the 3rd tick, just below the red. I stopped and checked the coolant, it was really low. Filled it up. Drove for a bit more, it was fine for about 10 km, then shot back up. Looks like there is a bit of a leak collected on the splash guard underneath. Although it might also be just water collected there. The coolant did need to be refilled again however..which makes me think it is a leak.

Its funny because my friend has the exact same car as me, and we took that out on a trip and the same thing happened! Coolant low, high temps. I am not too familiar with these systems and I am wondering if there is a common spot for coolant to leak. Or could the coolant need refilling constantly because it is just filling up the system, which was maybe empty before?

Vehicles both are perfect operating temperature in city driving.

Conditions are -20 degrees Celsius and snowy.
Vehicles both have approx 60,000 km. I used a premixed 'esso' brand coolant premixed.

Thanks so much for you help, it is greatly appreciated!
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Old 12-30-2008, 01:54 AM   #2
2.5i
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Well to tell you the truth I have had the same problem as well, at I replaced my t-stat thinking that was the problem... which helped, some. I still noticed the same problem, but once its warmed up a bit its hasn't persisted. You've have just explained word for word what my car was doing.


When I pulled over to check under the hood to see if there was any problems that I could see of. I did notice there was a collection of water at the bottom of the squash guard, I also noticed there was water coming from underneath the radiator cap.

I know the coolant system never was low on water until it started getting colder and said problem occurred. I am unsure why or how this problem came to be, but it really is starting to worry me since this shouldn't happen.
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Old 12-30-2008, 03:48 AM   #3
2.5impreza
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I figured that my friend and I would not be the only ones with this problem!

I think I may try to do a complete coolant flush. Maybe find some premixed stuff that is made to work in low low temperatures.

I need to find an answer to this problem, I need my car for ski trips!!
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Old 12-30-2008, 04:15 AM   #4
2.5i
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Does your fan turn off when it gets up that high? Mine does and it sucks lol. I have done a coolant flush when I replaced the t-stat as I said it got better, but didn't fix the problem.
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Old 12-30-2008, 05:38 AM   #5
GT11
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does it only happen in cold temps?

I live in constant 80-90 degree temps all year round and this gets me a little paranoid.
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Old 12-30-2008, 12:54 PM   #6
yarrgh
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almost sounds like your radiator cap is bad. if it doesn't hold pressure, then the cooling system will boil, when it boils, pressures increase quite a bit. if your cap can't hold pressure, it may leak. a lot.
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Old 12-30-2008, 01:44 PM   #7
rhino6303
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Quote:
almost sounds like your radiator cap is bad. if it doesn't hold pressure, then the cooling system will boil, when it boils, pressures increase quite a bit. if your cap can't hold pressure, it may leak. a lot.
Exactly right! My 2005 OBS did this once on the way to the mountain. When I got back I changed the radiator cap and voila! When the cap is bad, it releases way too much of your coolant into the overflow tank; chances are that you lost your coolant from there.
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Old 12-30-2008, 04:18 PM   #8
2.5impreza
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Quote:
Originally Posted by 2.5i View Post
Does your fan turn off when it gets up that high? Mine does and it sucks lol. I have done a coolant flush when I replaced the t-stat as I said it got better, but didn't fix the problem.
I dont think mine turns off..

Quote:
does it only happen in cold temps?

I live in constant 80-90 degree temps all year round and this gets me a little paranoid.
My guess is that it happens year round.. but I cant be sure. Its cold here pretty much every day!

Quote:
almost sounds like your radiator cap is bad. if it doesn't hold pressure, then the cooling system will boil, when it boils, pressures increase quite a bit. if your cap can't hold pressure, it may leak. a lot.
I will go buy a new cap right today! Thanks for the tips. Any other ideas are greatly appreciated!
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Old 12-31-2008, 04:03 AM   #9
2.5i
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Having a radiator cap go bad in two years I would figure they would last longer than that, although it does make sense.
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Old 12-31-2008, 11:32 AM   #10
aclver1
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I had it happen to my 04, it may have been a bad batch of radiator caps. It seems like there are quit a few of these stories for these years. I was wondering if changing to a Sti cap with a 1.3 bar will do anything?
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Old 12-31-2008, 05:53 PM   #11
2.5impreza
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bad news guys... changed the rad cap but i still lose coolant..

any other ideas?
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Old 01-01-2009, 01:42 AM   #12
bigrobwoot
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I was having that problem, only i wasnt loosing coolant. I think it gunked up the thermostat, because i changed my t stat and coolant and it worked fine.
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Old 01-01-2009, 11:24 PM   #13
2.5i
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Replace your t-stat, when it did mine it made the problem better but wasn't a true fix.
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Old 01-02-2009, 04:29 AM   #14
2.5impreza
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t-stat would not correct the leaking problem would it?
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Old 01-02-2009, 10:15 PM   #15
2.5i
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Were is it leaking from?
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Old 01-03-2009, 07:09 AM   #16
2.5impreza
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it looks like the bottom part of the reservoir. the cap area looks dry, just fluid on top of my splash guard.
how do you remove the reservoir to check it out?
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Old 01-03-2009, 10:44 PM   #17
mike 53
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Default cold temp o,heat

I have been researching the possibility of subaru,s overheating in really cold temps and this seems to be the first occurrence of it (possibly)that I have seen. When these thermostats were replaced ,were only genuine s/tats used .Did anyone notice if the bottom rad hose was cold.Did the problem go away at higher ambient temps.and has any one noticed a change in heat in the car or tried it out with the heater off. I would be very interested and will let you all know what I find.
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