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General BMW E36 Forum
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Old 09-10-2017, 03:01 PM   #1
Stubbornbard
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Join Date: Jun 2017
Location: Tulsa, OK
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My Ride: 2003 BMW 325i
Fast Coolant Leak

I have a coolant leak that started happening on my 1994 318is Manual.

I'll drive the car around until it warms up and everything is fine, no leaks. I park at an air pump to get some air, leave the car running, and after about 2min, I suddenly get a leak, a leak that would probably empty the system in about 2-3min, very fast leak. It's happened twice while trying to get air in the last couple days. Doesn't seems to start until I let it idle while at operating temp, or drive 15-20min.

The leak isn't visible from the top of the engine, but from the bottom it seems to be coming from the back of the engine on the passengers side. Do you guys have any suggestions on where the leak may be coming from?

I refilled the system yesterday, properly bled it, and was able to drive about 20min then it started leaking out and I almost overheated so I stopped and refilled.

Last edited by Stubbornbard; 09-10-2017 at 03:02 PM.
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Old 09-12-2017, 08:30 AM   #2
SimSimaz
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I unfortunately can't give you any advice on that. Had a similar issue on an old Mini I used to have and I think it actually ended up also being a problem with the radiator. I understand you won't want to go to a garage, but it might be the best option in this scenario!
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Old 09-12-2017, 11:47 AM   #3
Stubbornbard
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The leak is actually happening now when it's just sitting and I fill the car with fluid. Which is actually good for diagnosing it. I was able to get under it while it was leaking and have a look around. I can't find out exactly where it's coming from, but looks like it may be around the intake manifold area.

Since it's leaking from that area, and it's happening when sitting without the car being started, does that give any good pointers to what may be leaking?
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Old 09-13-2017, 12:05 AM   #4
jmo69
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I've never worked on a 4 cyl but there is supposed to be a coolant fitting on the back of the head and IIRC it's part of the casting. I think hose #17 connects to it. http://www.realoem.com/bmw/enUS/show...diagId=11_1402
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