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Old 12-05-2012, 03:15 PM   #1
Scooby Specialist
Member#: 38474
Join Date: Jun 2003
Chapter/Region: MWSOC
Location: Beach Park IL, USA
1998 Impreza Wagon L
Brilliant Red

Default 98 EJ22 Overheating issues

150,731 miles on it
Head Gaskets blew at 75K was replaced with Cometic HG

Ok so a few months ago I started noticing my cars temp was going up. after i get to work ~20miles. I added some coolent but that didnt seem to fix the problem. so I replaced the thermostat, that seemed to be fine for a few days but it came back. Then i replaced the Engine Temp Sensor, I had to do this since my fans were not kicking on. fixed the fan issue but not the overheating issue. So I was asked by my GF's dad who was a mechanic for 30+ years, if I was getting heat. I have no problem getting heat. Apparently that's suppose to be a way to tell if your water pump is bad? So I was told i could have gotten a "bad" thermostat. so i got another.. that didn't fix it. So i figured maybe my radiator is clogged since when my HG went awhile ago my coolent turned to cheese. So last night i replaced my radiator, new Coolent, and let it warm up. got to normal temps. still getting heat, drive it about 2 miles and the temp start to climb again. so i got it home and here it rests.

Anyone have any thoughts as to what it could be? Obviously the only think left in the cooling system that hasn't been replaced is the Water pump, just trying figure out if there is anything else i may be missing
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Old 12-05-2012, 04:10 PM   #2
Scooby Specialist
Member#: 294461
Join Date: Sep 2011
Chapter/Region: NWIC
Location: Grass Pants, OR
2006 San Remo Wagon
Under construction


What thermostat are you using? If it's not OEM spec with the "jiggler valve" for air bypass, it may be giving you hell still. Subarus are very finicky about the cooling system.
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Old 12-06-2012, 03:22 PM   #3
Scooby Newbie
Member#: 338593
Join Date: Nov 2012
Location: Richardson, Texas
1999 Legacy Outback


I'm not familiar with your engine, but on my 2.5L DOHC, it went through all of what you're describing and it was the head gasket. Mine was putting combustion gasses in the cooling system. You might check to see if your upper radiator hose is rock hard and if you're seeing any bubbles in the over flow tank. If so, I'm afraid you've got another set of head gaskets to do. Or you could pull the Tstat all together and run it without one and see if you can squeek by, though I don't know what kind of long term problems that may cause.
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Old 12-06-2012, 11:14 PM   #4
Scooby Specialist
Member#: 154586
Join Date: Jul 2007
Chapter/Region: BAIC
Location: San Ramon
1996 Turbo Outback
9psi on 91 No EM


My guess is headgaskets. It sounds like you already eliminated all other possibilites. How fast is it going through coolant? Did you burp the system after doing the radiator? Is it running poorly or hesitating at all?

+1 for oem thermostats
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Old 12-09-2012, 11:42 PM   #5
Scooby Guru
Member#: 30669
Join Date: Dec 2002
Chapter/Region: Tri-State
Location: USA, North NJ, 07456
1998 Legacy 2.5GT
Silver Sleeper BK, 5MT


Yep, my wifes 99 2.2 Impreza blew a HG. Since it was a 2.2 (I have a 98 2.5 Legacy) I said, "No way it has a blown HG!!"

With the engine cool, open the radiator cap, start the engine, burp/fill as required, look for bubbles of death.

As to thermostats & radiator caps, I ONLY use OEM.....period. Too many issues using other brands (for whatever reason).
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Old 12-09-2012, 11:46 PM   #6
Scooby Newbie
Member#: 319359
Join Date: May 2012
Chapter/Region: NESIC
Location: Rockland, MA
2002 Impreza RS


HG, dont drive the car anymore as you may have caused more damage (possible cracks) Replace those and remember to flush your coolent system every year.
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