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Old 03-31-2021, 10:02 AM   #21
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I think the internals are ok. I ran it at idle for a few minutes and no leaking. A bit of white smoke at first but nothing crazy. I kept it revved at 3k rpm for a few minutes, no fluid came out, and no white smoke. The exhaust smells a bit "sweet" but that could just be coolant burning off the pipes. I didn't get it all the way to temp but Im not gonna try until the new TStat gets here. If it happens at that point I'll swap in the new one, if not I'll hold on to it and see what happens.

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Old 03-31-2021, 11:13 AM   #22
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Exhaust smells sweet? Is that at the tailpipe or just overall around the exhaust?

Think you just had an air pocket or you over filled. I would get it up to temp at idle and check level...on a level ground that is or with only the rear lifted.

You could also rent a coolant pressure tester and see if it holds pressure. You can do this with the engine off at least.
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Old 03-31-2021, 11:57 AM   #23
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I just had a horrifying thought - what if I am completely wrong here and I have actually blown an internal engine component that is transmitting pressure from cylinder to the cooling system. I know the head gaskets are rock solid on an M96 but that could do it? Cracked cylinder I would think would cause serious intermixing of fluids and very slim chance of pressuring the coolant system. Ring failure wouldn't pressurize the coolant system, I don't think.

Oh my....


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Not to scare you even more, but that's a common method of failure in Subarus: Failing HG causing pressure into the coolant system. You can often see the bubbles coming up in the expansion tank. No oil/coolant intermix, generally. I don't know if the same happens in the M96. And like you said, M96 HGs are rock solid.
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Old 03-31-2021, 02:11 PM   #24
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Not to scare you even more, but that's a common method of failure in Subarus: Failing HG causing pressure into the coolant system. You can often see the bubbles coming up in the expansion tank. No oil/coolant intermix, generally. I don't know if the same happens in the M96. And like you said, M96 HGs are rock solid.
I knew about the ring land failures for the subies, didn't know about the bad head gaskets. My test today certainly isn't conclusive, I need to see what happens when I run it under load. If it leaks then, compression and leak down tests will be in order. I appreciate the heads up though, I will do some reading in them tonight.

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Old 03-31-2021, 03:26 PM   #25
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I would love it if you are right. But why would it "aggravate the system 2 years later? You've probably installed more of these than anyone. What would you do at this point?

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Pull a vacuum on the cooling system with the airlift system and see if any air comes out. Sometimes when one of these has air pockets, you get a surge in the system that can annoy the plastic tanks and create sudden leaks.

When did you last open up the cooling loop? I assumed from your comments on just getting the car back together that it was recently.
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Old 03-31-2021, 05:38 PM   #26
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Pull a vacuum on the cooling system with the airlift system and see if any air comes out. Sometimes when one of these has air pockets, you get a surge in the system that can annoy the plastic tanks and create sudden leaks.

When did you last open up the cooling loop? I assumed from your comments on just getting the car back together that it was recently.
Oh now I get what you were saying. No, I dont think this is a tank issue. I'm nearly certain all the flow was coming from the overflow tube itself.

The last time I did anything to the cooling system was around 2 years ago - system drain, 04 oem cap, and LN TStat install. No problems at all since then and had the usual "success" with lower running temps up until this happened.

I did a bit more poking around in the trunk while running it at 3k rpm (no load obviously) - mild vacuum on the oil tank, absolutely no positive pressure, so I think my rings are good. No signs of water/oil on the dipstick and no signs of oil in the coolant resivoir. However my oil stinks of gasoline. It's been 6k miles since last changed but that was a bit over a year ago. I figure it's from cylinder washdown since it's a 2.7 with a 3.4 tune, but I haven't driven enough to check afrs yet.

It can never be easy...but I suppose that's half the fun!

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Old 03-31-2021, 07:32 PM   #27
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OP said clear smooth liquid...could this be something other than coolant which is colored...or at least every antifreeze I've seen is colored not clear.
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Old 04-07-2021, 04:01 PM   #28
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Pressure test the cooling system?
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Old 04-07-2021, 05:57 PM   #29
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New BW TStat came today. I'm juggling a bunch of stuff right now but as soon as I get a chance I will drive the **************** out of it and see if it happens again. If it does, new TStat is going in.

Unfortunately I don't have a way to pressure test the system. I don't usually like just replacing parts but at $50 with the housing included this just seemed like the easiest routes to take.

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Old 04-08-2021, 05:45 PM   #30
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Update - I ran her hard for 20 miles today, needle straight up and kept it there for probably 15 minutes or so. No more coolant at that point coming from the overflow tube! Hooray!

However, when I popped the trunk there's coolant around the cap (.04 model, changed 2 years ago) and also the burp valve was closed but pushed open! I was able to push it back down but it just popped right back up.

Something is definitely up here. Im on the verge of going nuclear and replacing all of it - the TStat, cap, and burp valve but I know that's irrational and what I really need is more information. I think I will go ahead and flush the system tomorrow and swap in the new TStat just to make sure there are no signs of intermixing or sludge/debris in the system.

I'm hoping this doesn't have anything to do with the white chunks of debris I found in my oil filter tonight but I think that after the flush I'm gonna have to start doing some pressure testing of the coolant system and cylinders.

Any other thoughts?

BTW, feel free to chime in on the white chunks in the oil filter if you know what they are (pics posted on other thread)

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Old Yesterday, 03:21 AM   #31
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Update - I ran her hard for 20 miles today, needle straight up and kept it there for probably 15 minutes or so. No more coolant at that point coming from the overflow tube! Hooray!

However, when I popped the trunk there's coolant around the cap (.04 model, changed 2 years ago) and also the burp valve was closed but pushed open! I was able to push it back down but it just popped right back up.

Something is definitely up here. Im on the verge of going nuclear and replacing all of it - the TStat, cap, and burp valve but I know that's irrational and what I really need is more information. I think I will go ahead and flush the system tomorrow and swap in the new TStat just to make sure there are no signs of intermixing or sludge/debris in the system.

I'm hoping this doesn't have anything to do with the white chunks of debris I found in my oil filter tonight but I think that after the flush I'm gonna have to start doing some pressure testing of the coolant system and cylinders.

Any other thoughts?

BTW, feel free to chime in on the white chunks in the oil filter if you know what they are (pics posted on other thread)

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Maybe combustion gases are getting into your coolant. Try this, it's cheap and quick:

https://www.harborfreight.com/combustion-leak-detector-64814.html?_br_psugg_q=combustion+leak+detector
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Old Yesterday, 03:45 AM   #32
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Maybe combustion gases are getting into your coolant. Try this, it's cheap and quick:



https://www.harborfreight.com/combustion-leak-detector-64814.html?_br_psugg_q=combustion+leak+detector
Hey thanks piper! I haven't seen such a thing before but looks simple enough. I appreciate the help.

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Old Today, 02:45 AM   #33
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Hey thanks piper! I haven't seen such a thing before but looks simple enough. I appreciate the help.

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If you use a combustion gas tester, test the tester fluid before relying on the results. I have had a kit not work before, it wouldn't change colors even when exposed to exhaust straight from the tail pipe. I think the one I got sat on the shelve for so long it lost its effectiveness maybe. Idk. Probably an isolated incident, but thought it worth mentioning.

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Old Today, 03:39 AM   #34
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If you use a combustion gas tester, test the tester fluid before relying on the results. I have had a kit not work before, it wouldn't change colors even when exposed to exhaust straight from the tail pipe. I think the one I got sat on the shelve for so long it lost its effectiveness maybe. Idk. Probably an isolated incident, but thought it worth mentioning.

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Thanks GL, that's a great idea. Book knowledge is important, but experience is importanter

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