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Old 05-14-2019, 09:49 PM   #1
Roughridn_sob
Scooby Newbie
 
Member#: 501582
Join Date: May 2019
Default NEWBIE EJ22 overheat

First I wanna introduce myself my names Levi, this is my first subaru. Been a toyota guy my whole adult life mostly offroad stuff and have always turned to forums for any problems.
1999 Subaru Impreza outback sport
EJ22 181k 5spd
-Borla catback exhaust
otherwise completly stock

Known Maintenance done by previous owner:
-Replaced Radiator
- Thermostat delete mod (SMH I know!)

Recent Maintenance done by me
-Brand new Aisin Water pump and gates timing belt and associated bearings and what not including a new stant thermostat
-Full coolant flush with new additive.


The Problem:
Ever since i bought the car it has had an overheating issue.
-Wont overheat when sitting and idling
-Only gets to what I would call 75-80% on the temp gauge but it will flucuate and go back down to normal for random periods of time then back up but never goes all the way up. It takes 20-30 min of HWY driving before it starts to get hot before that it sits right in the normal range.

Troubleshooting
-No water/coolant in oil
-No Oil in coolant
-"Block test" came out good so no hydrocarbons in the coolant system if its to be believed i know they are hit and miss.
-Coolant goes to expansion reservoir when it gets hot and then after engine cools it draws it back to radiator.

my first guess was head gaskets but in all my other experience a blown head gasket would have other indicators and it would get hot and stay hot not fluctuate but I am a newbie to the boxer motors. Any help anyone can provide is greatly appreciated, any cheap troubleshooting to determine root cause would be great if i have to pull the motor and do the HG I will but I dont wanna do it for no reason when it could be something else Im just not familiar with.
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Old 05-14-2019, 10:20 PM   #2
Jack
Add Lightness
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Member#: 13699
Join Date: Dec 2001
Chapter/Region: NESIC
Location: Hopkinton, MA
Vehicle:
2021 Building
It Better

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Sounds like you have air in the cooling system. Thoroughly burp the sytem with a funnel feeding coolant into the high point in your system. I think you only have the radiator cap in your car and not a high side coolant tank.

I tend to overfill the coolant tank after I do this just in case. Yah, it'll blow coolant all over the place as it gets hot.
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Old 05-14-2019, 11:45 PM   #3
Roughridn_sob
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Member#: 501582
Join Date: May 2019
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Quote:
Originally Posted by Jack View Post
Sounds like you have air in the cooling system. Thoroughly burp the sytem with a funnel feeding coolant into the high point in your system. I think you only have the radiator cap in your car and not a high side coolant tank.

I tend to overfill the coolant tank after I do this just in case. Yah, it'll blow coolant all over the place as it gets hot.
No my expansion tank is located on the same.plane as the radiator on the driver side. I've tried over filling the expansion tank but it just does as you said and blows everywhere and still seems to overheat. I tried traditional burping methods of jacking the front of the car up and running to it got warm and pumping the collar t hoses but I will try and get ahold of a funnel system.
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Old 05-15-2019, 06:34 AM   #4
Roughridn_sob
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Member#: 501582
Join Date: May 2019
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Ide like to add that I never lose my heater when all this happens
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Old 05-15-2019, 09:05 PM   #5
Roughridn_sob
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Member#: 501582
Join Date: May 2019
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Here's a video I took while burping look like head gasket or is it normal to surge like that when revved. Cause of the water pump surging? Don't mind the ticking type sound it doesn't sound like that in real life.

https://drive.google.com/file/d/1yRkGQn_VgVt66o_X9ox9yxLMJPsPYCI5/view?usp=drivesdk

And also a video of the temp gauge fluctuating

https://drive.google.com/file/d/1yrFI7wndA8ikUf-7XqHJqBklQKX-zD2S/view?usp=drivesdk
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