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X3 E83 (2004 - 2010)
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  #1  
Old 04-25-2016, 12:49 PM
ZZ4444 ZZ4444 is offline
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N52 coolant flush: stupid question

Hi,
I did the coolant flush on my 3.0si 2008 X3, just removing the radiator screw, and first filling with water, then with 65/35 coolant/water.

All DIY I have read state that you need to fill until it overflows through the bleeder screw. Which I did. But after the venting procedure, and after having the engin run 15 minutes (water was still not hot though), the little stick behind the cap is still over the max. Should I take a ride and see? What do you think?

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  #2  
Old 04-25-2016, 01:40 PM
acoste acoste is offline
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Here are the repair instructions from BMW:


Adhere to the following work sequence when adding coolant.

- Switch ignition on
- Seat heating to maximum temperature and fan to low speed (heater valves are opened and auxiliary water pump starts
up).
- Slowly fill expansion tank with coolant.
- Close vent screw after bubble-free coolant emerges or after filling up to max. cold fill level.

Vent cooling system.
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  #3  
Old 04-25-2016, 01:59 PM
ZZ4444 ZZ4444 is offline
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Thanks!

Close vent screw after bubble-free coolant emerges

So that means when you see the coolant overflowing from that screw, right? Which I did...
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  #4  
Old 04-25-2016, 02:05 PM
acoste acoste is offline
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Yes but you might have overfilled.

If there is too much coolant, there will be some overpressure at operating temperature and the excess coolant will exit through the expansion tank cap valve. A healthy cooling system survives that with no problems however if you can, avoid stressing the system.
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  #5  
Old 04-25-2016, 02:06 PM
acoste acoste is offline
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Quote:
Originally Posted by acoste View Post
- Close vent screw after bubble-free coolant emerges or after filling up to max. cold fill level.
they say OR
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  #6  
Old 04-25-2016, 02:08 PM
SonicBoom SonicBoom is offline
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^^^ I thin there is a step missing there. Something like holding down accelerator for a certain amount of time.
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  #7  
Old 04-25-2016, 02:09 PM
ZZ4444 ZZ4444 is offline
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Thank you. Now, how can I remove some...
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  #8  
Old 04-25-2016, 02:11 PM
acoste acoste is offline
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Quote:
Originally Posted by SonicBoom View Post
^^^ I thin there is a step missing there. Something like holding down accelerator for a certain amount of time.
that is in the venting part. i remember seeing it for the 35i motor but can't find it for yours, let me check
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  #9  
Old 04-25-2016, 02:12 PM
ZZ4444 ZZ4444 is offline
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Quote:
Originally Posted by SonicBoom View Post
^^^ I thin there is a step missing there. Something like holding down accelerator for a certain amount of time.
Yep part of the venting procedure which I did.
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  #10  
Old 04-25-2016, 02:17 PM
acoste acoste is offline
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For the E90 with the same engine this is their procedure:

Venting cooling system:

Note:

Do not open the coolant expansion tank cap during the venting
procedure.

1. Connect battery charger.

2. Switch on ignition.

3. Set heater to maximum temperature and turn fan down to lowest speed.

4. Press accelerator pedal for 10 seconds to floor. Engine must not be started.

5. The venting procedure is started when the accelerator pedal is pressed and takes approx. 12 minutes. (Electric coolant pump was activated and shuts down automatically after approx. 12 minutes).

6. Then top up fill level in coolant expansion tank with 100 ml above max. (see Fig. R17 0450).

7. Check cooling system for leaks.

8. If venting has to be carried out again (e.g. if cooling system is leaking), allow DME to fall completely (leave ignition key removed for approx. 3 minutes), then repeat from Point 3.

Only when venting!

Perform filling operation slowly.

Fill coolant expansion tank with 100 ml above max.

100 ml corresponds to A=6 mm.
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  #11  
Old 04-25-2016, 02:20 PM
acoste acoste is offline
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  #12  
Old 04-25-2016, 02:39 PM
ZZ4444 ZZ4444 is offline
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Does that mean I should vent a 3rd time?
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  #13  
Old 04-25-2016, 02:51 PM
acoste acoste is offline
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Quote:
Originally Posted by ZZ4444 View Post
Does that mean I should vent a 3rd time?
I don't think so. Just remove the excessive coolant (with a straw) down to the level they mention. Drive the car lightly until the thermostat opens plus 10 minutes. Let the car cool down completely and check the coolant level. Correct it if needed (this time it should be between min and max).
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  #14  
Old 04-25-2016, 03:53 PM
dukedkt442 dukedkt442 is offline
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Don't run the engine until the proper electronic pump bleeding sequence was initiated. Ensure the pump is actually pumping (you can hear it). With the fan out (I don't install it until the system's been bled for this reason), you can reach your hand down and feel the pump running.

And you want a 50/50 mix. Coolant by itself neither cools nor resists freezing especially well, and water doesn't resist freezing/boiling as well as when mixed, nor does it probably lubricate the water pump and protect against internal corrosion.
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  #15  
Old 04-25-2016, 10:33 PM
ZZ4444 ZZ4444 is offline
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Good morning from Europe!

Duke: yes, the two venting procedure worked like a charm. Reason why I mixed 3 liters of BMW coolant with 1.5 liter of water is simple: I did one first flush with 5 liters water only. Provided I only removed 5 liters from the system through the radiator screw, among the total of 8.5 liters of coolant, I think it is wise to put a bit more coolant fluid than 50 50, otherwise might be there are less coolant in the system than wanted. You follow me?

This morning I checked again, and guess what, seems it is back to normal.. Thank you night...







It seems reasonable now, or?

Last edited by ZZ4444; 04-25-2016 at 10:34 PM.
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  #16  
Old 04-25-2016, 10:50 PM
acoste acoste is offline
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Good job! Nearly done

If you want to be the precise German you may want to remove the excess coolant since it appears to me that it's a bit above the maximum. It's hard to see it from this angle.
However if you leave it like that is fine too.
If you go back to the image I posted earlier that distance A should be 0 or negative. There is a sign right from the cap describing how it should look like.

Last edited by acoste; 04-25-2016 at 10:52 PM.
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  #17  
Old 04-25-2016, 11:02 PM
ZZ4444 ZZ4444 is offline
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Hi Acoste,

Great thanks! I'm a bit more French but living in Germany, so I'll think about it, it shows actually at max

Thanks again!
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  #18  
Old 04-26-2016, 10:00 AM
acoste acoste is offline
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Quote:
Originally Posted by ZZ4444 View Post
Hi Acoste,

Great thanks! I'm a bit more French but living in Germany, so I'll think about it, it shows actually at max

Thanks again!
Perfect
that explains why you are on this forum instead of the German ones. Have a nice day!
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  #19  
Old 04-26-2016, 02:26 PM
dukedkt442 dukedkt442 is offline
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When cold, I like to have the float rod floating between the two balls with respect to the top of the tank; when hot, the float is at it's max (I believe fluid says "hot" for that lower ball). Over-filled tanks, because their is no overflow tank, have been linked to exploding tanks, which these vehicles are renowned for. It's an expansion tank (where the excess goes), not the radiator, remember.

As an aside... that looks like oil in your coolant in your second pic, unless it is coolant-froth?
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  #20  
Old 04-26-2016, 09:38 PM
ZZ4444 ZZ4444 is offline
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Hi there,

Ok I'll remove some. It is still on stands, I need to finish this and start the valve gasket thing.

When flushing it two times, I haven't seen a trace of oil. Must be froth, despite it was after a night... Great thanks!
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  #21  
Old 04-27-2016, 08:03 AM
R ODonnell R ODonnell is offline
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Quote:
Originally Posted by dukedkt442 View Post
When cold, I like to have the float rod floating between the two balls with respect to the top of the tank; when hot, the float is at it's max (I believe fluid says "hot" for that lower ball). Over-filled tanks, because their is no overflow tank, have been linked to exploding tanks, which these vehicles are renowned for. It's an expansion tank (where the excess goes), not the radiator, remember.

As an aside... that looks like oil in your coolant in your second pic, unless it is coolant-froth?
I agree. I keep mine on the low side (top ball even with the top edge).
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  #22  
Old 04-28-2016, 09:10 AM
abscate abscate is offline
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Quote:
Originally Posted by dukedkt442 View Post
When cold, I like to have the float rod floating between the two balls with respect to the top of the tank; when hot, the float is at it's max (I believe fluid says "hot" for that lower ball). Over-filled tanks, because their is no overflow tank, have been linked to exploding tanks, which these vehicles are renowned for. It's an expansion tank (where the excess goes), not the radiator, remember.

As an aside... that looks like oil in your coolant in your second pic, unless it is coolant-froth?
Thats the float color - I made that same mistake earlier this year, thinking I had a bad head gasket. I think I even came clean on it in the thread.
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  #23  
Old 04-28-2016, 07:15 PM
dukedkt442 dukedkt442 is offline
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Ah yes, that's correct. It's been a while since I've stared in there; quick tap of the rod would quickly show the truth.
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