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E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio - General Forum
The E9X is the latest evolution of the BMW 3 series including the highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! Post questions about "upgrading" from your current E46 here or jump over to E90Fanatics.com!

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Old 07-30-2010, 11:18 PM   #1
Multibimmer
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Coolant flush

My wife's 2007 328i has almost 60,000 miles, so I think it's time to drain and replace the coolant. I did a search, and to my amazement, nothing turned up. Has anybody ever done this on an E9X? Is is straightforward, or are there any gotcha's? Thanks.
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Old 07-31-2010, 03:14 PM   #2
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There is a air bleed screw right below the fill neck. After you fill the system with as much as you can get in there, then you have to open that screw, put a battery charger on the battery in the trunk or the terminal's under the hood. Then you have to turn on the water pump which is electric and run for 10 minutes. This is in order to get all of the air out of the system. Then close the air bleed screw and finish filling with coolant.
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Old 07-31-2010, 03:40 PM   #3
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Thanks for the quick reply - that's very helpful. What about the draining step? Is there a drain plug on the block? If so, where is it located, and how much of the plastic paneling do you have to remove to get to it? Thanks.
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Old 07-31-2010, 08:14 PM   #4
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I will have to go read about it. I know you have to take off a radiator hose. Another thing I have read about is the Evans Water less coolant. Water is hard on aluminum. If the air hits exposed aluminum radiator cores it will corrode. I'm sure that goes for the block too. Also the outside of the block is magnesium, of which you do not want any water to touch at all.

I will change my collant to waterless after the summer is over. Too much work right now. I only have 24000 miles on the car any way.
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Old 08-01-2010, 09:17 AM   #5
AlbAtRoS
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check engine lamp it might come on after u drain the coolant with the code FC 2E83 Elevtric coolant pomp,power-reduced operation,dry run,so top upthe coolant level to the lower edge of the expansion tank,close the expansion tank,switch on the ignition ,set heating to the maximum, press the accelerator pedal module to the floor for at least 10 second - engine of ,bleed via EWP takes approximately 12 minut,check coolant circuit and drain plougs for leaks
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Old 08-01-2010, 12:14 PM   #6
jimdoss
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The best bet for you is to buy yourself a Bentley Repair Book that covers 3 series BMW's 2006 to 2009.

That way you have most of the story in front of you.

What ever you do, do not let the seal in the water pump dry out or you will have to buy another and the price for them is high.

Search for the book on line. They run from $87.00 to $140.00.

Good luck,
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Old 08-01-2010, 01:05 PM   #7
Multibimmer
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Ths is all starting to sound a bit complicated, for something so simple as draining the coolant out of a car, refilling, and bleeding. Does the Bentley manual really cover the job accurately? I've heard mixed reviews of the Bentley manuals for various tasks on various cars, plus they're pretty expensive for a repair manual.

One quick question - how exactly do you turn on the electric water pump for the bleeding process? Thanks.
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Old 08-01-2010, 04:12 PM   #8
AlbAtRoS
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is your car auto or manual ? diferent proseedure
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Old 08-01-2010, 05:36 PM   #9
Multibimmer
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Here's a great thread explaining step-by-step how to do the coolant flush:

E90 N52 Engine Coolant Change - BMW 3-Series (E90 E92) Forum - E90Post.com

I don't remember if it mentions a different procedure for an auto vs. a manual, tough (mine's an auto)
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Old 08-01-2010, 08:13 PM   #10
AlbAtRoS
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that's y i do my car whith coolant flashing machin to flash engen block to
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