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E34 (1989 - 1995)

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  #1  
Old 09-23-2012, 08:03 PM
apocolyps3 apocolyps3 is offline
E38 2001 740 il
Location: Tempe, AZ
 
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Mysterious coolant leak

Hi,
I have this leak whenever I open the coolant cap and after I drive my 95 E34 540i. I finally found the source of this leak in the pic provided.
What is this valve and why is it leaking? I thought it was the hoses but it is not. Your input is greatly appreciated.

The pic doesn't show the valve but that is the location. Thanks!
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  #2  
Old 09-23-2012, 09:26 PM
air_cooled air_cooled is offline
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Need more help mate. Got a picture from the top. Is this on the drivers side? Heater Valve?!
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  #3  
Old 09-23-2012, 10:38 PM
apocolyps3 apocolyps3 is offline
E38 2001 740 il
Location: Tempe, AZ
 
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That's the problem. There is no indicator of a leak from the top side. It is location on the driver side. It is in the area of the heater hoses.
Other than the picture I took, I am stumped.

The valve leaks whenever I open the coolant cap. It sounds like the vacuum release the coolant through this valve from what I can deduce.
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  #4  
Old 09-24-2012, 12:45 PM
My525iT My525iT is offline
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Yes, need more help on the pic.
Maybe, draw a overall diagram to pinpoint.
I will be under my car tomorrow and am curious.
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  #5  
Old 09-24-2012, 01:37 PM
apocolyps3 apocolyps3 is offline
E38 2001 740 il
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ALright, I will go get a better picture tonight. The exhaust pipe is block the view but I will see if I can move the pipe.
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  #6  
Old 09-25-2012, 12:03 AM
apocolyps3 apocolyps3 is offline
E38 2001 740 il
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Alright, I finally figured out the source of the leak. It wasn't a valve but a hose. I don't know what kind of hose. I hope you can help me out.
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  #7  
Old 09-25-2012, 10:19 AM
robertobaggio20 robertobaggio20 is offline
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I can't make sense of the pictures but judging by the fact that its close to your exhaust pipes, could it be a transmission cooler?

Hmmm....no that shouldnt be the case, coolant does not go the tranny, tranny fluid is pumped to the radiator out front and then back. Am I correct?

The overall perspective is unclear. Could you take a zoomout shot and then zoom in, or could you take a video?
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  #8  
Old 09-25-2012, 10:35 PM
paperplane94 paperplane94 is offline
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Very weird...

Hose coming from the heater valve to a pan on the underside of the transmission?
WTH for?
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  #9  
Old 09-26-2012, 12:34 AM
apocolyps3 apocolyps3 is offline
E38 2001 740 il
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I figured it out. It was the trans oil coolant lines (intake side). I guess it uses coolants to cool down the transmission.

Well, I finally repaired with with various hoses I found. So far...it held.

Just too bad I dropped a small piece of rubber somewhere near the engine. It smells of burnt rubber now...
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  #10  
Old 09-26-2012, 10:20 AM
paperplane94 paperplane94 is offline
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Quote:
Originally Posted by apocolyps3 View Post
I figured it out. It was the trans oil coolant lines (intake side). I guess it uses coolants to cool down the transmission.

Well, I finally repaired with with various hoses I found. So far...it held.

Just too bad I dropped a small piece of rubber somewhere near the engine. It smells of burnt rubber now...
Very weird...As mentioned earlier, the trans fluid is cooled by lines of ATF fluid running to the radiator. Coolant was never in the equation. Go figure.
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  #11  
Old 09-26-2012, 10:45 AM
apocolyps3 apocolyps3 is offline
E38 2001 740 il
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Yup....I could never figure it out from the coolant diagram but it is there. It is a hassle to take it out....LOTS of WD40...
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  #12  
Old 09-26-2012, 12:13 PM
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Radian Radian is offline
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Quote:
Originally Posted by apocolyps3
It is a hassle to take it out....LOTS of WD40...
If you're serious about wrenching on your own vehicle, I recommend Kano Aerokroil over any other penetrating oil. It will save you time. I've got a small can of WD40 too, but I use that for it's originally intended purpose as a rust-preventative for the hand tools. In practice, the performance between the two is night and day.
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  #13  
Old 09-26-2012, 12:58 PM
apocolyps3 apocolyps3 is offline
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Thanks for the info
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