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Old 11-11-2012, 11:44 PM   #1
Pickler
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Default water temperature too high?

the water temperature on my car seems to hover around 88'c most of the time. however sitting in traffic for long duration (+3min) i get spikes to about 95-100'c (boiling temperature). on a hot summer day with A/C on i saw it hit 103'c in traffic. but once you get rolling with good speed it goes back to high 80s Celsius. this is concerning because on some of my cars i used to run straight water in summer and if i do this with the subaru (which i won't) it means i will boil the water and cause problems. that's not right!? even still is this temprature healthy for a subaru with only 40k miles and 4 years old? is the oem coolant Not good enough?
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Old 11-11-2012, 11:57 PM   #2
chazly413
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too many friction losses

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That's the boiling temperature for water at atmospheric pressure. The coolant system is pressurized, the water will have to be at a higher temperature to boil. I'm also pretty sure that the coolant-water mixture has a higher natural boiling point, also.
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Old 11-12-2012, 10:09 AM   #3
GrundleJuice
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Quote:
Originally Posted by Pickler
the water temperature on my car seems to hover around 88'c most of the time. however sitting in traffic for long duration (+3min) i get spikes to about 95-100'c (boiling temperature). on a hot summer day with A/C on i saw it hit 103'c in traffic. but once you get rolling with good speed it goes back to high 80s Celsius. this is concerning because on some of my cars i used to run straight water in summer and if i do this with the subaru (which i won't) it means i will boil the water and cause problems. that's not right!? even still is this temprature healthy for a subaru with only 40k miles and 4 years old? is the oem coolant Not good enough?
Are both of the fans working?
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Old 11-12-2012, 05:29 PM   #4
Pickler
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Quote:
Originally Posted by RaceFaceXC View Post
Are both of the fans working?
not sure i do sometimes hear them turn on when my window is down but to be honest they are not as pronounced as on my other vehicles. i will pay attention to that. but my main concern is wether 100 deg Celsius temperature is normal for an impreza in traffic. on my Acura the radiator fans still remain on when i shut off the car in the parking lot if the coolant temp is a bit higher than normal but the subaru doesn't do this.
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Old 11-12-2012, 08:44 PM   #5
chazly413
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Get the car good and warmed up and then park it, let it idle, and watch the fans to see if none, one, or both come on. They should come on eventually, regardless of outside temp. Also, if you're stopped at a light and you have the windows down, you should hear the fans kick in, assuming the engine is good and warmed up.
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Old 11-12-2012, 08:52 PM   #6
GrundleJuice
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Thermostat could cause slightly higher temps if it's opening slowly or partially.

Last edited by GrundleJuice; 11-12-2012 at 10:43 PM.
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Old 11-13-2012, 02:25 PM   #7
Mishimoto
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^ Your temperature does not seem too excessive. I would still check to see that both the upper and lower radiator hoses are getting hot when up to operating temperature and that your fans are operating.
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Old 11-13-2012, 04:00 PM   #8
Pickler
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ok the fans are working although thry are very quiet so i couldnt tell from inside my car. they work when temprature hits 100'c and cease when its 95'c again.
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Old 11-13-2012, 04:09 PM   #9
eg33GC
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you may just have an air bubble somewhere, but even at 105* it is still OK
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Old 11-13-2012, 04:23 PM   #10
V8Slayer
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When was the last time you flushed your coolant? Also, what are you using to view your coolant temps?
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Old 11-13-2012, 05:15 PM   #11
Mishimoto
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Originally Posted by V8Slayer View Post
When was the last time you flushed your coolant? Also, what are you using to view your coolant temps?
I would also like to know this.
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Old 11-13-2012, 05:43 PM   #12
Pickler
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coolant was never flushed still original. according to the manual i still got 5 years but i was planning to just do it next year summer. some have told me that long life coolants like the oem are generally poor performing. but i'm too scared to use after market because of the demands in the user manual and the head gasket issues with our cars.

i use Scangauge 2 to monitor temperatures, it just displays back the numbers the ECU is reporting. according to some SGII users i have talked to the water temprature number is bullet proof. also i know this number is accurate because the blue water temp light turns off after the coolant temperature reaches 50'c (122'F) as described on pages 3-16 and -17 of my Subaru's manual.

Last edited by Pickler; 11-13-2012 at 09:09 PM.
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Old 11-14-2012, 06:47 PM   #13
V8Slayer
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Scangauge is a reliable source to get your reading, any fin damage to your radiator? Being that the temps have come down(just noticed your from TO!), have you noticed if the temps still shoot up when stopped in traffic? If all else fails you could always contact your dealership about this problem.
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Old 11-18-2012, 12:17 PM   #14
Bluefoton
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Seems a few degrees high to me. On my 08, I hardly ever see it going above 95, even in summer heavy traffic . On my old 03, the only times I saw it go beyond 100 was during autocross and when my HG blew.

If you don't flush the coolant, check its pH though. One of the alleged reasons for HG failure in our engines is that they're sensitive to the pH..and my local mechanic prefers to flush it too often than not often enough. Your thermostat could be due for a change too..
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