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Old 05-21-2018, 09:26 PM   #1
Scooby Newbie
Member#: 338394
Join Date: Nov 2012
Location: ERIE PA
2010 Impreza 2.5i
Sparky Silver

Default 2010 Ej253 OverHeating

Wondering if anyone has experienced the same issue, I have an overheating issue, that I have been chasing for a while, radiator, temp sensor, thermostat, have been replaced in the last 6 months, actually on my second thremostat, and the water pump was replaced 2 years ago when I had to replace the short block. But I experience the overheating issue at random time, yesterday I autocross ed my impreza all day we did 9 runs at about 45 seconds long, and no issues, as soon as I got on the highway and 4 miles down the road the car over heated, normally the light would just blink red, which tells me the coolant is appove them normal running temp, but this time is was solid red, and I lost the whole reservoir worth of coolant. I'm stuck and the dealership, just keeps telling me to replace parts that I have already replaced, I know you can get bad parts new, but not this many times in a row. Any help will be much appreciated.
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Old 05-22-2018, 11:46 AM   #2
Scooby Specialist
Member#: 118334
Join Date: Jun 2006
Chapter/Region: SWIC
Location: Global Time Attack Street AWD
2006 Carmine Red WRX
2005 Aspen White RS


If it's been overheated that many times already, it's likely that the head gasket has failed or in the process of failing.
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Old 05-22-2018, 11:56 AM   #3
Scooby Specialist
Member#: 182415
Join Date: Jun 2008
Chapter/Region: Tri-State
Location: New York
1999 RS
Aspen White


Did the reservoir overflow to lose coolant or is it just using it? If the coolant level keeps dropping, most likely the head gaskets are leaking internally. If it just boiled out because it was hot it may be another issue. Sustained RPM from cruising will run temps up a little, if your condenser fins are jacked up you'll lose a lot of airflow to the rad, happens all the time especially with older cars that get driven a lot.
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Old 05-23-2018, 03:12 PM   #4
Scooby Newbie
Member#: 3409
Join Date: Jan 2001
Chapter/Region: NWIC
Location: Oly
98 My FMIC
Is bigger than yours.


Subaru head gaskets never fail. It must be something else.

Said nobody ever.

Block test it. If you're pushing coolant out like that, it'll no doubt fail a block test.
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