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Old 08-20-2005, 06:26 PM   #1
shemoves
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1997 Outback

Default 2.2T motor fail-closed thermostat?

I ask this question in order to diagnose an overheating problem. Everything was working great, but I decided to flush the coolant anyway (bought the car off a friend, did not know how old the coolant was...I know, if it ain't broke, don't fix it ). I bought one of the Prestone hose-flush kits. Everything went really smoothly, but, as I was refilling the coolant I ran into a glich.

While it was filling, water suddenly started spewing out of the hose connection. My guess was that the thermostat failed from the water pressure, and it is a fail-close, preventing any flow.

Here are some other related questions that may help me. Can the overflow tank get boilover if the coolant system is not full or close to full? Where is the thermostat?
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Last edited by shemoves; 08-20-2005 at 08:16 PM.
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Old 08-20-2005, 09:42 PM   #2
jsaunders
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It's fail safe, not fail close. The fail safe- if there are any problems it will be stuck open to prevent overheating. It sounds like you do have to change the thermo. as you might not have a fail safe thermo.
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Old 08-21-2005, 12:08 AM   #3
Legacy777
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AWD 6MT EJ22T AWIC Swap

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Where did you hook up the hose kit? where is the water leaving the cooling system?
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Old 08-21-2005, 04:59 AM   #4
shemoves
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May have had a simple fix, thank God. As it turns out it was about a quart+ low on water. I was trying to finish the refill using the overflow tank...yah that does not work. I used the pressure cap opening, and ran it for a bit before I went out. I did not think such a small amount of water could make such a big difference.

Fail safe (fail-open), really good to know, and a relief.

The hose kit it installed on the engine 'in' tube. The tube runs from the firewall to the engine (non water pump). I used the radiator drain plug hole.

If this all ends up working out, I am definitely going to put it on my STi.
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Old 08-22-2005, 01:36 PM   #5
Legacy777
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The drain plug on the radiator isn't really going to flow enough out of it compared to what the garden hose is putting in. I'd personally want another outlet for the water....but that's me.
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Old 08-22-2005, 11:55 PM   #6
shemoves
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after doing it...agreed
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Old 08-24-2005, 08:56 AM   #7
IronMonkeyL255
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When filling mine up, I just dumped it into the upper radiator hose until it was full and finished it the rest of the way woth the remote reservoir.
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