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Old 01-23-2013, 11:02 PM   #1
BoostinX
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Default 2.0L cooling issue PLEASE HELP!

I have done alot of searching reguarding the cooling system and bleeding air from the system, and have only found situations similar to mine. Looking for some advise/direction from anyone...

Problem: Can not get air out of cooling system and thermostat will not open, also cooling fans will run non stop..probably to keep motor cool because T stat isnt opening...

Just had the motor out of the car for last few months for little refresh, did not touch rotating assembly, but replaced headgaskets. Also replaced most all other gaskets/hoses/seals etc, new oil pump, water pump, cooling tubes, rubber hoses, new t stat, timing components. Have bleed sys multiple times, can get tstat to open and almost all air out, but next day or after a drive it closes back up and lower hose is cold? There are also no coolant leaks anywhere at this time...

My questions are...has anyone experienced anything similar? Do you know how air could continue to get into the cooling system? Why I may not be able to get all air out? Headgasket problem/combustion leaking by?

Any input is greatly appreciated
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Old 01-24-2013, 01:08 AM   #2
jvallepu
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Do u have bubbles in ur coolant res? I always simply fill the radiator then fill the turbo coolant res and run it. it bleeds itself just keep an eye on the coolant level on the radiator res. keep it full. Also check if ur system is building pressure.
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Old 01-24-2013, 01:58 AM   #3
wrxkid157
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^^^^take the caps off the coolant for a while until all the air bubbles bubble out. (it my take some time) and the T-stat you put in might be a faulty one.
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Old 01-24-2013, 02:08 AM   #4
CanadianImprezaSTi
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Quote:
Originally Posted by wrxkid157 View Post
^^^^take the caps off the coolant for a while until all the air bubbles bubble out. (it my take some time) and the T-stat you put in might be a faulty one.
It does sometimes happen that the T-stat is faulty. You can throw it in a pot of boiling water when you get it new to test it. Takes 5 minutes and you know it's good.

However, since it's in there. Do as the other guys have said. Start it up and look in the rad cap to see if bubbles are forming.
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Old 01-24-2013, 09:54 PM   #5
killacam661
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i ran my car for 15 min with no radiator caps after my head gasket change last week. takes a couple times but just add coolant to the res after a drive if its low... itll become filled and stable
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Old 01-24-2013, 10:09 PM   #6
jaxscuby
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which direction did you install the thermostat?
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Old 01-25-2013, 12:56 AM   #7
BoostinX
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The tstat is installed correctly, spring towards motor...pretty sure it only goes in one direction...it is also brand new form subaru and I did test it in boiling water and it did open. There are bubbles in my coolant res, I have been using a spill proof funnel on the upper res and have ran the car multiple times, each time burping the sys from upper hose and running the motor and each time there are bubbles in the res. I can get 95% of bubbles to go away, tstat is open whole cooling sys is operating correctly, heat in the cabin and not over heating.

Thing is after that, top off over flow res and install radiator cap...then go for a drive, not long after the fans will kick on full blast and stay on, lower hose and tstat housing will be cold, and vehicle has been at operating temp the whole time. Next morning the overflow res will have dropped from the full mark? and fans will still run and tstat won't open again.
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Old 01-25-2013, 07:30 AM   #8
quazimoto
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Maybe your water pump is borked.
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Old 01-25-2013, 12:07 PM   #9
PSBeachBum
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maybe a backward head gasket? dunno how thats possible but never know.

or maybe small animal got into the coolant piping and in now stuck on the thermostat
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Old 04-23-2013, 09:16 PM   #10
rexrexwrx
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What did u come up with I'm having the same problem any info would help
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Old 04-23-2013, 10:43 PM   #11
DabiDa
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Are the gasket seals on the cap ok?My buddy had a issue with his 03 bugeye boiling and could not find the problem so we got a new cap for the turbo res and bam was just a faulty gasket that would let air in and out..
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Old 04-24-2013, 12:57 AM   #12
wrx1392
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drill a small 1/8" hole in the Tsat .
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Old 05-02-2013, 11:30 AM   #13
cranky18
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Having the same problem on my 02 after a headgasket replacement. What temperature do the fans come on at?
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Old 05-08-2013, 12:04 AM   #14
subaru_gc8
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did you guys get the heads resurfaced? before you put the back? here is a test to know whats going on

http://www.autozone.com/autozone/acc...er=391378_0_0_

get one and know if the head gasket is sealing properly
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Old 05-08-2013, 01:05 AM   #15
wikedcobra312
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Leave radiator cap on and burp system through res tank, no overheating here in az
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Old 05-08-2013, 02:09 AM   #16
lagwagn
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Have you turned the heat on full while bleeding the system?
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Old 05-08-2013, 05:44 PM   #17
CalvinT
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Quote:
Originally Posted by lagwagn View Post
Have you turned the heat on full while bleeding the system?
This makes no difference. Coolant always flows through the heater. There is no coolant valve for the heater.
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Old 05-08-2013, 06:45 PM   #18
Mishimoto
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Quote:
Originally Posted by subaru_gc8 View Post
did you guys get the heads resurfaced? before you put the back? here is a test to know whats going on

http://www.autozone.com/autozone/acc...er=391378_0_0_

get one and know if the head gasket is sealing properly
+1 on this question and suggestion. Depending upon the head gasket failure you may have warped the heads. The tester shown is a great way to identify failure.
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