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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 08-26-2014, 12:52 PM
z168 z168 is offline
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Upper Radiator Hose

So this happened yesterday...


After a 10mile freeway drive the old gal held it in till I got to my office. Steam started to come out just as I was pulling up the parking space. I was able to get a replacement hose from the stealer and did the swap in 3 minutes. What took me longer was bleeding the system.

Anyway, never had a hose give way like this. I wonder if the brown discoloration of the plastic coupling was an indication of it about to break. Thoughts?
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  #2  
Old 08-26-2014, 01:06 PM
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energizedmortal energizedmortal is offline
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this is going straight to the "where to find telltale cracks" thread! Thanks for posting.

When is the last time the cooling system re haul was done? This is an indication that other cooling part failures may follow. Last thing you want is that fan clutch blade to turn into flying ninja stars. I'm due for a re haul, my previous cooling re haul was done in 2010 50,000 miles ago and i'm already leaking some drops of coolant from the radiator again.
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Old 08-26-2014, 02:32 PM
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Judging by the pic, this doesnt look like "coolant system failure" to me. Just looks like the clamp came loose. But 10 miles is a long way to go with no coolant.
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Old 08-26-2014, 05:04 PM
damisco damisco is offline
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Not to scare you but hoses failure is mostly associated with other cooling system components you should be checking on it every once in the while b4 it does something else
Good luck


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Old 08-26-2014, 05:10 PM
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Old 08-26-2014, 05:55 PM
pshovest pshovest is offline
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What's the date stamp on the plastic hose end? Looks like a clock face with 0-12 (month)on outside and then two digits (year)in the middle.
It looks like the plastic hose end broke at the edge of the clamp. Is there a piece of the plastic hose end still inside the hose?
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Old 08-26-2014, 06:23 PM
AH673000 AH673000 is offline
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When your black plastic radiator or other water side components turn chocolate brown or slim green it is time to change them.


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Old 08-27-2014, 04:30 AM
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Quote:
Originally Posted by pshovest View Post
What's the date stamp on the plastic hose end? Looks like a clock face with 0-12 (month)on outside and then two digits (year)in the middle.
It looks like the plastic hose end broke at the edge of the clamp. Is there a piece of the plastic hose end still inside the hose?
Good catch. It does look like the hose is expanded further in than the remaining length of plastic pipe. It probably does has a chunk inside the pipe. If thats the case, time for some new cooling system parts.
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Old 08-27-2014, 07:52 AM
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Mine did the same exact thing on my 540i. I temporarily clamped it and drove it until I got the replacement.

My Z3 had the similar failure but by the connection of the radiator.

I believe this seems to be the area of highest coolant turbulence and pressure.

Anyway, Just finished with the cooling overhaul of both cars .. Everybody says it's the smart thing to do. And it is.




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Old 08-27-2014, 10:35 AM
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Quote:
Originally Posted by energizedmortal View Post
this is going straight to the "where to find telltale cracks" thread!
Namely ...
- A pictorial view of all the ways the cooling system can fail on the BMW E39 (1)
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Last edited by bluebee; 08-27-2014 at 10:39 AM.
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  #11  
Old 05-15-2015, 11:30 AM
z168 z168 is offline
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I apologize for the long lag in my response. I wasnt able to follow this thread since I already fixed it.


Quote:
Originally Posted by Flybot View Post
Judging by the pic, this doesnt look like "coolant system failure" to me. Just looks like the clamp came loose. But 10 miles is a long way to go with no coolant.
I meant I drove 10 miles on the freeway and once I exited and pulled up to my office parking steam started to come out. So that indicates the hose broke off only at that point



Quote:
Originally Posted by pshovest View Post
What's the date stamp on the plastic hose end? Looks like a clock face with 0-12 (month)on outside and then two digits (year)in the middle.
It looks like the plastic hose end broke at the edge of the clamp. Is there a piece of the plastic hose end still inside the hose?
I didnt realize I havent replaced the upper since I got the car in 08. Replaced expansion tank 2x, level sensor 2x, lower hose once in 2010. But between 6 shop visits and 2 coolant flushed I figured the shop covered the upper hose. I guess they didnt.

I havent replaced my radiator since I got the car. Tell tale signs again Bee?
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Old 05-15-2015, 02:27 PM
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doru doru is offline
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Plastic parts on OP's car are cooked. Judging by the pic, the plastic elbow has turned brown, meaning it's brittle. He has to look at the other plastic & rubber parts and see if they turned brown or green-ish too.
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Old 05-15-2015, 03:08 PM
z168 z168 is offline
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Quote:
Originally Posted by doru View Post
Plastic parts on OP's car are cooked. Judging by the pic, the plastic elbow has turned brown, meaning it's brittle. He has to look at the other plastic & rubber parts and see if they turned brown or green-ish too.
Thats what I was thinking - anything that discolors is a prime candidate for replacement. The other end if you notice didnt turn a different color
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