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Old 07-15-2013, 08:52 PM
Dami916 Dami916 is offline
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2008 650i coolant bleed

I just replaced my expansion tank. Does anybody know how to bleed the cooling system?
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Old 07-16-2013, 03:32 AM
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I just read two methods in the last coupe of weeks.

The TIS says fill it, start it (fill cap off), let bubbles come and top off. Put cap back on, drive to temp, let cool and top off.

I did see another procedure the other day that bled the system, but I can't remember how to start it now. I'll try to find it later and post it if know one else chimes in.
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Old 07-16-2013, 06:12 AM
tampamark tampamark is offline
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I have always done it by leaving the radiator cap open while the car is running. Do this when the car is cold. Don't remove the cap before starting the car as it will sometimes burp liquid up, once you start take the off cap and watch the liquid flow. It allows the air out, and then while running slowly add fluid in.

Never takes long. Careful as it gets hot!
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Old 07-16-2013, 07:19 AM
Dami916 Dami916 is offline
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Do you know if BMW 650i has electric water pump?
I found bleeding procedure for electric pump but it seems to me that does not work.
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Old 07-16-2013, 09:48 AM
HerbP HerbP is offline
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The cooling system is self bleeding. If you remove the cap, you can watch the coolant recirculate from the bleeding tube that runs across the top of the radiator. I recommend only using the BMW coolant.

Good Luck!
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Old 07-20-2013, 05:08 PM
Dami916 Dami916 is offline
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yesterday, a week after replacement of the expansion tank I noticed a drop of coolant on the garage floor (right next to right front wheel). I drove today and looked underneath the car, and I didn't see anything wet. Any suggestions?
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Old 07-20-2013, 06:01 PM
Dami916 Dami916 is offline
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sorry for double posting, but I just found something new. This is some rubber sticking out of the front suspension. Is this normal?
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Old 07-21-2013, 12:10 AM
rebel.ranter rebel.ranter is offline
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The coolant system in the 6 Series is self-bleeding. It has an electric water pump & there is an automatic bleed procedure that takes 12 minutes, procedure below.

1. Insert the key into the dash slot and hit the starter button (but donít start the engine Ė e.g. keep your foot off the bake/clutch).

2. When the ignition is on, set the heater to the highest temp (84 deg.) and set the fan on low.

3. Hold down the accelerator pedal for 10 seconds then release. This activates the water pump and it will cycle for about 12 minutes to vent all the trapped air into the coolant reservoir (it sounds like a min washing machine). Donít open the reservoir cap or bleed screw during the venting process! (youíll have start the process over) You may want to hook up a extra battery to the under-hood jumper points to keep the carís battery from running down.

4. Once the water pump stops after 12 minutes, open the reservoir cap (it will hiss a little) and add coolant until the measuring stick (ball indicator) is 6 mm above the top of the filler neck. (review the manual procedure for checking the coolant level so you know what Iím saying)

5. Close the cap and check for leaks in the system (the hose connections you took off).
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Old 07-21-2013, 05:30 AM
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Quote:
Originally Posted by Dami916 View Post
sorry for double posting, but I just found something new. This is some rubber sticking out of the front suspension. Is this normal?
I believe that is a thrust rod bushing. It is common for them to go bad. I replaced mine myself by just buying the entire arm. I got the set for 129.00 at Northside Imports in Chicago.
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Old 07-21-2013, 02:30 PM
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Quote:
Originally Posted by Dami916 View Post
yesterday, a week after replacement of the expansion tank I noticed a drop of coolant on the garage floor (right next to right front wheel). I drove today and looked underneath the car, and I didn't see anything wet. Any suggestions?
My guess is that it got really hot and your reservoir overflowed a little. Before you start your car (when cold) take off the coolant cap and look to see if there is a little white trace in the ring and overflow tube.
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