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Posted by xXEclipse, Nov 14, 2010
Newbie Forum - Beginner/newbie/general DSM modification questions. First mods, how to run 10's when you haven't run 12's yet, any tech question that doesn't fit in another tech forum.
1 : Check your coolant reservoir. These are known to leak. Pull it out, blow into the top. If there are any pinholes, you'll know.
2 : A bad turbo with a bad seal/cracked coolant passage can cause this. It will blow coolant, burn it, or blast it into the coolant system which will cause the overfill to flow out.
3 : A bad heater core.
4 : Bad lines, leaking in places you can't easily see.
5 : Your coolant cap could be bad, allowing the coolant to either spill out, or it would not allow pressure to build up and the coolant will simply evaporate.
Your best bet is to pressure test your coolant system. Then do a compression test, a leak down test, and check the above noted things before you set off to pull the head. It's always best to start small and work your way up only to find out that when you pull the head that it was a cracked reservoir.
Is it burning any smoke? What color? Is there a sweet smell when you drive your car? Is your oil an odd color? Details.
Remember that when you're driving and the hotter the car gets/the longer it runs, everything get's pressurized. I'd replace those hoses where they're leaking...that shouldn't even be questioned.
As far as losing coolant via the Turbo, I have a friend with a GST that this happened to. All that happened is he was burning coolant under boost. No null effects on his engine, just a bad turbo. Swapped the turbo and it was all fine. He didn't know where the coolant was going either until I followed him one day and he made a quick pull.
I did find this picture however and it could be possible that there might be a heat crack behind the heat shield (behind the turbine). How it would form I couldn't say.
Edit: Did you do a pressure test of the radiator ? or a Leak down test? Sounds like if you did a pressure test(on the Radiator) you may have your awnser...
EXACTLY! if the coolant reservoir is bubbling, it is caused by cylinder pressure being forced into the cooling system via a lifting or leaking head gasket. So in this CASE the FIRST thing I would suspect is the HG. That is why I didn't mention anything else in the cooling system. You can replace all that other garbage...but you will just end up wasting more money. You dont always have to have milky oil/coolant with a bad HG.
This is mostly true, however, the HG is not the only culprit that causes this. Again, if it is blowing coolant via the turbo it will cause this. I've seen it first hand. In fact I can likely go get a video of it sometime soon. Not saying that the HG is NOT the problem, I'm just stating that it's POSSIBLE.
That's very interesting. I'm saving this cut-away without question. Leave it to you to dig something like this up.
While it does look improbable, you can't rule it out. We've all seen weird things happen with these vehicles, haven't we? The only reason that I'd suggest this is if I knew there were proof, and I've seen it first hand. HG was good, no coolant in oil, and it very lightly smoked on idle. At Boost it would blow coolant. Ripped out the turbo, slapped a new one on, problem fixed. I'll see if I can get ahold of that buddy and ask if I can take his turbo apart and try to research it a bit and snap some pictures.
Just for clarity's sake.. this was on a Stock T-25.
I hope your issue is something small and is an easy fix. Good luck. Hope your back up and running soon.
Another thing you may want to check is the heater core...
Sorry, but I don't really have more to offer than what has already been stated by others. Good luck.
Doesn't it leaking while the engine is not running rule out head gasket? =/