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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 5 Series > E34 (1989 - 1995)

E34 (1989 - 1995)

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  #1  
Old 09-18-2013, 06:16 PM
sybronis sybronis is offline
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Mein Auto: 95 540i
Coolant tube leak haaaalllppp!

Soooooo, figured out my coolant leak. Its the tube. What I'm not sure of is if I need a new tube our just the seals. It is leaking off of the back near the firewall, right from where the tube goes in the coolant manifold off the heads. Its at a shop now (got a loaner for free thank God!) What parts and tools will I need if I decide to do it myself, how much time should I allow myself to complete the job, and are there any how to videos anyone knows of? Thanks in advance!
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  #2  
Old 09-18-2013, 10:08 PM
imae34driver imae34driver is online now
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Mein Auto: 1995 540i SPORT /6 spd
The tube under the manifold?
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  #3  
Old 09-19-2013, 01:41 PM
Mr._Graybeard Mr._Graybeard is offline
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Have you changed your water pump lately? If not, I'd be suspicious that the valley pan seal has sprung a leak directly beneath the tube's junction with the coolant manifold at the back of the block.

A leaky valley pan is pretty common. If you pull the intake manifold you can replace the O rings and reseal the valley pan while you're in there.
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  #4  
Old 09-19-2013, 10:04 PM
sybronis sybronis is offline
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Yes the tube under the manifold.
The water pump has been changed I believe if what I heard is true about stock water pumps being plastic impeller, mine is steel.
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  #5  
Old 09-19-2013, 11:02 PM
Mr._Graybeard Mr._Graybeard is offline
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The o-ring sealing the coolant tube in the coolant manifold may have been knackered during the water pump R&R. Sometimes the tube accidentally gets pulled out of its socket and the O-ring can't reseal.

Unfortunately, it's hard to get to the coolant manifold without removing the intake manifold. And while you have the manifold off, you might as well reseal the valley pan to avert the possibility that you'll have to take the intake off again down the road.

Here's a good video on servicing the valley pan gasket. Coolant tubes are also covered.

Last edited by Mr._Graybeard; 09-19-2013 at 11:03 PM.
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  #6  
Old 09-28-2013, 11:27 PM
sybronis sybronis is offline
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Excellent video, need to do water pump and valley pan gasket and radiator as well.
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  #7  
Old 11-02-2013, 06:19 AM
amcole amcole is offline
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Hi,

I have a 1993 525I....are you referring to the transmission coolant?
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  #8  
Old 11-02-2013, 08:24 AM
Mr._Graybeard Mr._Graybeard is offline
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Quote:
Originally Posted by amcole View Post
Hi,

I have a 1993 525I....are you referring to the transmission coolant?
This thread pertains only to V8s, not the sixes. I suspect you're confused about what to feed your transmission -- assuming it's an automatic, it gets automatic transmission fliud (ATF). Sometimes equipment failure lets coolant into the transmission, but that's very bad.
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  #9  
Old 11-03-2013, 08:38 AM
amcole amcole is offline
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Sometimes equipment failure lets coolant into the transmission, but that's very bad. ? please explain that statement more.....how bad?
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  #10  
Old 11-03-2013, 11:01 AM
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E34ZombieHunter E34ZombieHunter is offline
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Coolant can harm parts, only approved fluid should be into the trans and anything else for that matter and anything other that approve fluid can ruin it rather quickly.
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  #11  
Old 11-03-2013, 12:36 PM
Mr._Graybeard Mr._Graybeard is offline
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Failed transmission coolers have been known to let coolant mix with the transmission fluid. Then the fluid takes on a milky look. If you just have a leak at the radiator the mechanic may have simply failed to tighten a fitting. If that's the case you'll see drips of clear red oil.

I suggest you focus on the thread you started rather than this one. That's the proper forum etiquette, rather than to pose a new question in an existing thread. No big deal, just thought you'd want to know.
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