Welcome to Bimmerfest -- The #1 Online Community for BMW related information! Please enjoy the discussion forums below and share your experiences with the 200,000 current, new and past BMW owners. The forums are broken out by car model and into other special interest sections such as BMW European Delivery and a special forum to voice your questions to the many BMW dealers on the site to assist our members!

Please follow the links below to help get you started!

Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 5 Series > E39 (1997 - 2003)

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

Reply
 
Thread Tools Display Modes
  #1  
Old 04-28-2015, 06:17 PM
Rustyzipper's Avatar
Rustyzipper Rustyzipper is offline
97' 540i
Location: Chicago
 
Join Date: May 2008
Posts: 326
Mein Auto: 540iA
Leak under expansion tank

Hi all.....

Been awhile from posting on here, my 97 540 has been running fine. Today I put more miles on it then normal.. got home and there is a fast drip under the expansion tank (TG) I was home. Is this a Tank swap?? or am I looking at something else?? all dry above the bottom of the tank....just under. Thanks for any help. FYI, my Ex Tank has only one hose connection on the side.

Rusty.
__________________
97' 540iA Build 4/96
73' 911 Targa Whale Tail
86 Coupe deville Convertible

Last edited by Rustyzipper; 04-28-2015 at 07:25 PM.
Reply With Quote
Advertisement
  #2  
Old 04-28-2015, 06:39 PM
five40 five40 is offline
Officially Welcomed to the 'Fest
Location: Arkansas
 
Join Date: Feb 2014
Posts: 133
Mein Auto: 540i6
I think that's a pretty common failure. I have not had to deal with it myself yet, but tank failures seem like a regular occurrence 'round these parts.
Reply With Quote
  #3  
Old 04-28-2015, 06:53 PM
Rustyzipper's Avatar
Rustyzipper Rustyzipper is offline
97' 540i
Location: Chicago
 
Join Date: May 2008
Posts: 326
Mein Auto: 540iA
Thanks five...ya, been in the back of my mind since i got her. Just glad I was home.
__________________
97' 540iA Build 4/96
73' 911 Targa Whale Tail
86 Coupe deville Convertible
Reply With Quote
  #4  
Old 04-29-2015, 03:57 AM
nedmon nedmon is offline
Officially Welcomed to the 'Fest
Location: new canaan
 
Join Date: Jul 2006
Posts: 101
Mein Auto: 1998 528i, 1987 Carrera,
Is the hose clamp tight?
__________________
Ned,
98 528i
87 Carrera
07 CRV
Reply With Quote
  #5  
Old 04-29-2015, 04:48 AM
Rustyzipper's Avatar
Rustyzipper Rustyzipper is offline
97' 540i
Location: Chicago
 
Join Date: May 2008
Posts: 326
Mein Auto: 540iA
Yep Ned... all dry around it. Thinking hole at the bottom of the tank, won't really know till i take it out.

Any tips on taking it off??...seems pretty straight forward.

Thanks
__________________
97' 540iA Build 4/96
73' 911 Targa Whale Tail
86 Coupe deville Convertible
Reply With Quote
  #6  
Old 04-29-2015, 10:03 AM
Zerodynamic's Avatar
Zerodynamic Zerodynamic is offline
Respect my authoritay!
Location: 925
 
Join Date: Feb 2015
Posts: 500
Send a message via Skype™ to Zerodynamic
Mein Auto: 2001 540i6
If your tank is leaking, that's a pretty good sign that the rest of your cooling system may need an overhaul. When one piece of plastic starts to fail....
__________________
Current Ride: 2001 540i6/Cosmos on Black/E60 SSK/CDV Delete/ZHP Knob/Euro Corners/M5 Front Bumper w/front respray/SS Brake Lines/Drilled and Slotted Rotors
Coming Soon: Tint/Rear M-Tech Bumper/Cat Back Magnaflow
Past Loves: 00 528iA/95 M3/90 535i5
Reply With Quote
  #7  
Old 04-29-2015, 10:54 AM
bluebee's Avatar
bluebee bluebee is offline
Seek to understand,^Value
Location: San Jose, California
 
Join Date: Mar 2008
Posts: 24,152
Mein Auto: 02 BMW 525i M54 auto 130K
There's a good look inside the expansion tank here:
- Behr radiator and Behr/Heat expansion tank autopsy (1)

This may also help:
- How to remove just the expansion tank to repair a leak during your cooling system overhaul (1)
__________________
Please read the suggested threads, where the best always add value to those threads, either by pictures or by descriptions, so the next person with the same problem stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need
Reply With Quote
Reply

Bookmarks


Forum Navigation
Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 5 Series > E39 (1997 - 2003)
Today's Posts Search
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On



Forum Jump


All times are GMT -7. The time now is 11:41 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2015, vBulletin Solutions, Inc.
© 2001-2015 performanceIX, Inc. All Rights Reserved .: guidelines .:. privacy .:. terms