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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Hemorrhaging coolant



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      05-03-2019, 12:26 PM   #1
Vulcan50
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So went for my first real drive since finishing my my turbo replacement, and when I stopped, there is coolant pouring out, near the water pump. My guess (hope) is that one of the water pump/thermostat lines is loose. Easy fix.

Is there anything else I should look at if the lines are good? Common points of failure?
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      05-03-2019, 12:30 PM   #2
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Originally Posted by Vulcan50 View Post
So went for my first real drive since finishing my my turbo replacement, and when I stopped, there is coolant pouring out, near the water pump. My guess (hope) is that one of the water pump/thermostat lines is loose. Easy fix.

Is there anything else I should look at if the lines are good? Common points of failure?
I would bet on the u-pipe on the water pump. I would also check the coolant line on the turbo. It's easy to damage the o-rings on the lines.
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      05-03-2019, 01:07 PM   #3
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I have my doubts that it's the turbo line, because of the amount coming out and where it's located. Additionally I repacked all the orings, and all went smoothly.

The upipe or the tstat lines are my guess.
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      05-03-2019, 11:35 PM   #4
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So the thermostat is split. There are 3 "tabs" equidistant apart that should have bolts running through them holding the halves together. The pictures I've seen have bolts, mine don't. Is this an early version?

Has anyone tried the Rein thermostat? Awesome price and there other
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      05-12-2019, 04:26 PM   #5
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More frustration

Does anyone know what each of the 4 lines on the tstat does?

I replaced the tstat an went for a drive. When I stopped it was leaking a bit. Then while I was watching, it just puked a bunch out. Like something switched open and dumped.

I'm hoping that a line popped off and this will help me figure out which
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      05-12-2019, 06:15 PM   #6
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Quote:
Originally Posted by Vulcan50 View Post
Does anyone know what each of the 4 lines on the tstat does?

I replaced the tstat an went for a drive. When I stopped it was leaking a bit. Then while I was watching, it just puked a bunch out. Like something switched open and dumped.

I'm hoping that a line popped off and this will help me figure out which
4 lines? are you refering to the hoses? If so then its the intake/output hoses and I belive the the turbo line intake/output hoses.

If your still loosing coolant the issue is a hose. It's possible that you either have air in the system, a hose has a small cut in it that only leaks with pressure, or the clamps are too loose/not 100% fitted around the waterpump/thermostats correctly.
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      05-12-2019, 10:44 PM   #7
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Quote:
Originally Posted by buster84 View Post

4 lines? are you refering to the hoses? If so then its the intake/output hoses and I belive the the turbo line intake/output hoses.

If your still loosing coolant the issue is a hose. It's possible that you either have air in the system, a hose has a small cut in it that only leaks with pressure, or the clamps are too loose/not 100% fitted around the waterpump/thermostats correctly.
Sorry hoses.
There's a plunger type mechanism inside and it dump suddenly, I watched it happen. So I'm wondering if it opened or closed allowing coolant to go to a hose it previously wasn't able to.


Edit:

Yesterday I was finally able to look into the second dump. Good news/bad news the good news is it was only the U pipe that had come off. The bad news, or at least frustrating news is that I didn't forget to tighten it, the hose clamp had actually snapped.
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