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 > 6 Series > E63 / E64 6 Series (2004 - 2010)

E63 / E64 6 Series (2004 - 2010)
The E63/E64 BMW 6 Series builds on BMW's sporty heritage with aggressive lines and an incredible motor to back the design up. Available in coupe and convertible trims with a standard 4.8 liter engine producing 360 horsepower and 360 lb-ft of torque, the 6-series is a popular choice that exceeds expectations.

Reply
 
Thread Tools Display Modes
  #1  
Old 11-07-2015, 04:29 PM
sunboyu sunboyu is offline
Registered User
 
Join Date: Nov 2015
Posts: 36
Mein Auto:
coolant losing fast

Hi everyone,
I got my 2008 BMW 650i 1 years ago. I notice that I need to refill my coolant every 3 month/3000-3500miles with highway mileage around 70-90 MPH. I live in LA area, the weather can reach 90F-100F in summer, but I don't think this would make coolant losing too fast. Is there someone has the same issue?
Reply With Quote
Advertisement
  #2  
Old 11-07-2015, 05:03 PM
tim330i's Avatar
tim330i tim330i is offline
Bimmerfest.com Founder
Location: SF
 
Join Date: Dec 2001
Posts: 11,155
Mein Auto: Ti Silver 03 M3
I loved your question to the 6 series forum. Sounds like a leak to me.
Reply With Quote
  #3  
Old 11-07-2015, 06:57 PM
Futureb0y Futureb0y is offline
Registered User
Location: U.S.
 
Join Date: Sep 2015
Posts: 3
Mein Auto: 2005 645ci
Complete refill? Or top it off?

If you just have to top it off, sounds like you have an extremely slow seep...I wouldn't even call it a leak if its only every 3 months. 1st step is run your fingers around every hose connection point, around the water pump, coolant tank, etc etc, and see if you detect any moisture. Are there any small puddles in the driveway?
Reply With Quote
  #4  
Old 11-07-2015, 08:25 PM
HerbP HerbP is offline
Officially Welcomed to the 'Fest
Location: Georgia
 
Join Date: Jul 2009
Posts: 3,969
Mein Auto: 2005 645Ci & 2007 750Li
All coolant leaks seep to the bottom under panel of the car, & drain to the low point. Remove the front panel under the car, & let the car idle while looking for leaks. The coolant will then drop down to the area under the car, & be easier to find. The expansion thank is known for cracking & leaks down near the passenger front tire. Other common leaks are from the coolant sensor on the lower radiator hose, & the coolant bypass line just above the radiator is another good place to look.
Reply With Quote
  #5  
Old 11-08-2015, 04:25 PM
sunboyu sunboyu is offline
Registered User
 
Join Date: Nov 2015
Posts: 36
Mein Auto:
Quote:
Originally Posted by Futureb0y View Post
Complete refill? Or top it off?

If you just have to top it off, sounds like you have an extremely slow seep...I wouldn't even call it a leak if its only every 3 months. 1st step is run your fingers around every hose connection point, around the water pump, coolant tank, etc etc, and see if you detect any moisture. Are there any small puddles in the driveway?

Well, I just checked it today. After 20 minute high way driving, the temperature raised about 225F. When I arrived at home, I turned off my engine, and opened hood. I heard the water boiling sound with little air leaking sound at the coolant tank area. But I feel nothing with my finger, and there is no smell of it. I agree with you it could be a very slow leak, but do you have any idea about how to find where is it?
Reply With Quote
  #6  
Old 11-08-2015, 05:21 PM
HerbP HerbP is offline
Officially Welcomed to the 'Fest
Location: Georgia
 
Join Date: Jul 2009
Posts: 3,969
Mein Auto: 2005 645Ci & 2007 750Li
Quote:
Originally Posted by sunboyu View Post
Well, I just checked it today. After 20 minute high way driving, the temperature raised about 225F. When I arrived at home, I turned off my engine, and opened hood. I heard the water boiling sound with little air leaking sound at the coolant tank area. But I feel nothing with my finger, and there is no smell of it. I agree with you it could be a very slow leak, but do you have any idea about how to find where is it?

Don't get your temp gauge on the bottom of the cluster with water temp, that is the engine oil temp reading. You will get a warning on the Idrive when the water temp has gotten hot. By the time you get that warning, it is to late. If you hear noise at the expansion tank, that is a good place to look. Your coolant leak will be the easiest to find after a 15 minute drive, since it takes the engine a while to run hot. The expansion tank will usually leak out of the plastic seems, when it starts to fail. Look carefully behind it on the wheel well wall.
Reply With Quote
  #7  
Old 11-08-2015, 06:27 PM
sunboyu sunboyu is offline
Registered User
 
Join Date: Nov 2015
Posts: 36
Mein Auto:
Quote:
Originally Posted by HerbP View Post
Don't get your temp gauge on the bottom of the cluster with water temp, that is the engine oil temp reading. You will get a warning on the Idrive when the water temp has gotten hot. By the time you get that warning, it is to late. If you hear noise at the expansion tank, that is a good place to look. Your coolant leak will be the easiest to find after a 15 minute drive, since it takes the engine a while to run hot. The expansion tank will usually leak out of the plastic seems, when it starts to fail. Look carefully behind it on the wheel well wall.

Thanks for helping me here. But I can't see any thing leak out. I just came back from Walmart, it was just a 10 min local driving. When I got home, I checked it again, and there is no air leaking sound. I think the pressure it not strong enough to pull the vapor out, because the temp was not as high as highway driving. So, are there some problems of O rings?
Reply With Quote
  #8  
Old 11-08-2015, 06:33 PM
HerbP HerbP is offline
Officially Welcomed to the 'Fest
Location: Georgia
 
Join Date: Jul 2009
Posts: 3,969
Mein Auto: 2005 645Ci & 2007 750Li
The bottom lower radiator sensor has a o-ring that will leak when worn. The o-ring can be purchased at Home Depot. The engine should run cooler running down the highway, than local driving.
Reply With Quote
  #9  
Old 11-08-2015, 06:40 PM
sunboyu sunboyu is offline
Registered User
 
Join Date: Nov 2015
Posts: 36
Mein Auto:
Quote:
Originally Posted by HerbP View Post
The bottom lower radiator sensor has a o-ring that will leak when worn. The o-ring can be purchased at Home Depot. The engine should run cooler running down the highway, than local driving.

Thanks, I'll try to replace it.
Reply With Quote
  #10  
Old 11-09-2015, 11:56 AM
jimboy1983 jimboy1983 is offline
Registered User
Location: london
 
Join Date: Nov 2015
Posts: 3
Mein Auto: bmw 630i
From experience I know that a coolant leak will leave a white residue behind.
Reply With Quote
  #11  
Old 11-10-2015, 01:15 PM
sunboyu sunboyu is offline
Registered User
 
Join Date: Nov 2015
Posts: 36
Mein Auto:
Quote:
Originally Posted by jimboy1983 View Post
From experience I know that a coolant leak will leave a white residue behind.

I think I found it. Is it looks like this?Click image for larger version

Name:	ImageUploadedByBimmerApp1447190107.816659.jpg
Views:	69
Size:	184.8 KB
ID:	537839Click image for larger version

Name:	ImageUploadedByBimmerApp1447190119.087448.jpg
Views:	65
Size:	187.3 KB
ID:	537840
This panel is just under the temp sensor.
Reply With Quote
  #12  
Old 11-10-2015, 05:46 PM
sunboyu sunboyu is offline
Registered User
 
Join Date: Nov 2015
Posts: 36
Mein Auto:
Click image for larger version

Name:	ImageUploadedByBimmerApp1447206084.511793.jpg
Views:	63
Size:	277.9 KB
ID:	537876
My friend checked my coolant tank today. And we can see water on the upper side of the coolant tank. Due to this side does not have hoses and sensor, can I confirm that the coolant tank was broken?
Reply With Quote
  #13  
Old 11-11-2015, 02:59 AM
gregb's Avatar
gregb gregb is offline
Officially Welcomed to the 'Fest
Location: Marietta, GA
 
Join Date: Nov 2010
Posts: 1,155
Mein Auto: 2007 BMW 650 vert
Sounds like a cracked expansion tank which is a common failures item - happened to me around 100k miles
__________________
Regards, Greg


'07 650i vert, beige/jet black, sports & cold weather pkgs, comfort access, logic 7, sat radio, Miro M6 wheels (with Michelin super sports), M6 spare tire, tint, windscreen, triple resonator delete, m-tec AE's, LED kit, corner bulb delete and m-tec fogs
'11 Acura MDX Advance with Entertainment pkg for wife - no mod's '04 Acura TSX (daughter) and '12 VW GTI - Autobahn (son)
Reply With Quote
  #14  
Old 11-13-2015, 07:37 AM
HerbP HerbP is offline
Officially Welcomed to the 'Fest
Location: Georgia
 
Join Date: Jul 2009
Posts: 3,969
Mein Auto: 2005 645Ci & 2007 750Li
Quote:
Originally Posted by sunboyu View Post
Attachment 537876
My friend checked my coolant tank today. And we can see water on the upper side of the coolant tank. Due to this side does not have hoses and sensor, can I confirm that the coolant tank was broken?

You can remove the screws that hold the expansion tank in place, then watch the tank as the temp rises. You can then see if there is a crack. The leak in the middle of your engine could be the weep hole, or the y coolant pipe that might be leaking.
Reply With Quote
  #15  
Old 11-15-2015, 07:59 PM
Rdflite Rdflite is offline
Registered User
Location: Midland, Texas
 
Join Date: Jun 2015
Posts: 3
Mein Auto: BMW 645Ci
Coolant lose

In my 2007 650Ci, I found a leak on the connection to the auxiliary water pump that feeds the heater. I had to replace the temp sensor that is in the line to the auxiliary pump. The O-ring went bad but couldn't get it without the sensor. Cured my coolant level problem.
Reply With Quote
  #16  
Old 11-16-2015, 05:04 PM
HerbP HerbP is offline
Officially Welcomed to the 'Fest
Location: Georgia
 
Join Date: Jul 2009
Posts: 3,969
Mein Auto: 2005 645Ci & 2007 750Li
Glad you found the culprit!
Reply With Quote
Reply

See More Related BMW Stories


Forum Navigation
Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 6 Series > E63 / E64 6 Series (2004 - 2010)
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 11:01 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
© 2001-2015 performanceIX, Inc. All Rights Reserved .: guidelines .:. privacy .:. terms