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Faults, Fixes and DIY Please share your experience and knowledge with other members by contributing your own DIY, or by helping another member find the elusive fix!


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Old Sun, Mar-28-2010, 07:50:06 AM   #1
Function7
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Default DIY: Coolant flush (E46 M3)

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Originally Posted by ///Marini View Post
Someone should definitely make a DIY. This is the only fluid without a DIY and its probably the hardest to do.
The LR radiator (Laengerer & Reich) in the M3 does not have a drain plug.

Here's the pics I took when I changed out my fan clutch and flushed the coolant at the same time. I've used the pics to put together a quick DIY. This is just a quick and dirty coolant flush and does not address flushing out the coolant form the engine block so you'll leave in about 1/2 gallon of "old" coolant in there.

1. Open hood - grab a pair of pliers


2. Remove the top air duct (pull the center pin of the expanding rivets to remove - there are 4 holding the air duct in.)


2.a Pull off the intermediate the air duct that is in front of the air box and locate the coolant bleed plug (plastic plug with the + on top of the elbow) under it.


(no pics from here on -- space was too tight)

3. Reach in on the passenger (right) side of the radiator, look for the wire clip that locks the lower radiator hose to the radiator.

4. Unclip the metal clip (pull it up)

5. Rock the plastic end of the hose while pulling it off the radiator neck. Coolant will start draining when it is disconnected. Keep clear if you don't want to be splashed with coolant. Open the radiator cap to equalize the air pressure and let it drain some more.

6. Push the clip back on the plastic hose end. Push it back in all the way.

7. Now connect the hose back to the radiator outlet - the clip will snap and lock the hose in place. Check to make sure it is secure.

8. Loosen bleed plug


9. Fill coolant (I use a mix of distilled water and the BMW coolant - concentration varies depending on weather conditions, but 50-50 is recommended)


10. When correctly filled, the coolant should start flowing out of the bleed screw hole (I removed the bleed plug to speed this up). Make sure you get rid of all the trapped air (i.e. no more bubbles).


11. Tighten/replace bleed screw. Turn on the engine, and turn on the heat full blast. Let the engine run a little (2-3 minutes) and bleed off any residual air by releasing the bleed screw and watching for any bubbles. If there are no bubbles, you're good - tighten the screw and make sure no more coolant is leaking out of the bleed screw.

12. Top off coolant.

13. Cap off radiator cap.

14. Replace air duct.

Job done, now go have a beer.

-A
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Last edited by Function7; Sun, Mar-28-2010 at 07:57:07 AM.
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Old Sun, Mar-28-2010, 02:00:01 PM   #2
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Cool thanks for the easy DIY
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Old Wed, Apr-14-2010, 03:55:04 AM   #3
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Thanks for the writeup.. How do you do a full flush?
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Old Sat, Apr-17-2010, 02:59:19 PM   #4
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Yeah I'll second that, anyone got a linn to a full system flush?
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Old Sun, Apr-18-2010, 10:48:31 PM   #5
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http://m3forum.net/m3forum/showthread.php?t=282935

http://www.bimmerzone.com/coolant.htm
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Old Mon, Oct-11-2010, 05:13:09 PM   #6
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When pulling off the lower radiator hose, you don't find it necessary to replace the temperature sensor o-rings?
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Old Sun, Aug-18-2013, 12:32:25 AM   #7
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Default Re: DIY: Coolant flush (E46 M3)

Thanks guys for the DIY guide, I used the details to create a video which can be found here.





]
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Old Thu, Mar-27-2014, 01:13:04 PM   #8
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Default Re: DIY: Coolant flush (E46 M3)

Bump. Doing this Saturday (whole cooling system overhaul actually).

What about adding a cooling flush product and driving the car for awhile before doing this??
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Old Fri, Mar-28-2014, 07:25:09 PM   #9
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Default Re: DIY: Coolant flush (E46 M3)

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Originally Posted by SunD3v1L View Post
Bump. Doing this Saturday (whole cooling system overhaul actually).

What about adding a cooling flush product and driving the car for awhile before doing this??
Anyone?
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Old Wed, Oct-11-2017, 10:43:36 PM   #10
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Default Re: DIY: Coolant flush (E46 M3)

Wanted to bump this to ask a question about a full flush. I am wrapping up a VANOS rebuild and valve adjustment. I will be reinstalling the valve cover, spark plugs, coils, etc. The belts and pulleys are also off for replacement as well as the fan and upper radiator hose. Can I safely switch my car on to position 1 to open the heater core at this point? I haven't been able to start my car to check VANOS but I want to make sure if I wouldn't mess anything up with just switching ignition on only to open the heater core for a full flush.
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Discussing DIY: Coolant flush (E46 M3) in the Faults, Fixes and DIY Forum - Please share your experience and knowledge with other members by contributing your own DIY, or by helping another member find the elusive fix! at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)