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7 Series - E65 / E66 (2002 - 2008)
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  #1  
Old 04-12-2010, 08:05 PM
pigeon pigeon is offline
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Coolant flush?

It's been 2 years so it's time for a coolant flush. Anyone have a DIY, or should I just buck up and have the dealer do it when it's in later this week for yet more warranty work?
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  #2  
Old 04-12-2010, 10:32 PM
Call Me Daddy Call Me Daddy is offline
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I had mine done at and independent shop and I think they charged around $150. Not worth the mess for a DIY in my opinion.
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  #3  
Old 04-20-2010, 01:45 AM
TechGuy TechGuy is offline
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But BMW never recommends this job.
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  #4  
Old 04-20-2010, 07:06 AM
cjennjr cjennjr is offline
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Per the Owner's Manual, BMW recommends coolant change every four years. If you switch to the waterless coolant, no other changes are required.
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Old 04-20-2010, 03:06 PM
Maverick62 Maverick62 is offline
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DIY, just remove drain plug, let it run out. then fill with a 50/50 mixture . Get the right
antifreeze .
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  #6  
Old 04-20-2010, 07:20 PM
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USALEXUSBMW750 USALEXUSBMW750 is offline
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Quote:
Originally Posted by maverick62 View Post
diy, just remove drain plug, let it run out. Then fill with a 50/50 mixture . Get the right
antifreeze .
+1
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  #7  
Old 03-11-2011, 09:41 PM
zeekq zeekq is offline
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where is the drain plug? and after drainig do i need to run water thro? than fill it with bmw antifreez?
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  #8  
Old 03-12-2011, 12:02 AM
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Quote:
Originally Posted by TechGuy View Post
But BMW never recommends this job.
????
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  #9  
Old 03-12-2011, 07:54 AM
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USALEXUSBMW750 USALEXUSBMW750 is offline
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Quote:
Originally Posted by pigeon View Post
It's been 2 years so it's time for a coolant flush. Anyone have a DIY, or should I just buck up and have the dealer do it when it's in later this week for yet more warranty work?
Wait till your bottom hose radiator temp sensor start leaking, then change o-ring on it and flush the system, do everything in once

Last edited by USALEXUSBMW750; 03-12-2011 at 07:55 AM.
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  #10  
Old 10-29-2013, 11:29 AM
minhvotx minhvotx is offline
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Quote:
Originally Posted by zeekq View Post
where is the drain plug? and after drainig do i need to run water thro? than fill it with bmw antifreez?
Did you find out where the drain plug located? I need to do mine.
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  #11  
Old 10-29-2013, 11:36 AM
mgucci745 mgucci745 is offline
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I'm almost positive the drain plug is somewhere on the radiator. I saw some videos how to do a coolant flush on the n62 engine. It's as simple as unplugging the drain and refilling.
ALSO, if I'm using BMW BLUE COOLANT, do I still need to add 50/50 mix w/ distilled water???? The last few times i've put just blue coolant in and filled to the top.
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  #12  
Old 10-29-2013, 11:52 AM
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Nygel Nygel is offline
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passenger side bottom of radiator.
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  #13  
Old 10-29-2013, 12:32 PM
minhvotx minhvotx is offline
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Thank you mgucci745 for replying. I see a video showing the plug with red plastic cap on the lower passenger side of the radiator. Need to remove the under car panel to access.
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  #14  
Old 10-29-2013, 03:21 PM
gkent gkent is offline
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The BMW blue is not pre-mixed .... you need to mix 50/50 with distilled water.

Note the steps for coolant filling to ensure proper venting (taken from the TIS: http://bmw.workshop-manuals.com/7_Se...dex.php?id=798)

- Before filling expansion tank, turn ignition position on (don't start)
- Set Heat to maximum (blower low) ... this is important to ensure heater valves are OPEN and Aux water pump is ON ..
- Fill expansion tank up to Max
- With cap open, start engine and run at idle for 1 minute and shut off
- Fill coolant back to Max level and close cap
- Run engine up to operating temp (until thermostat opens). Check for leaks. (Do NOT open expansion tank cap when coolant is HOT)
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  #15  
Old 10-30-2013, 01:58 PM
minhvotx minhvotx is offline
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Good instruction. Done flushing my cooling system today. Thanks.
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  #16  
Old 10-31-2013, 07:11 PM
rippjd rippjd is offline
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Coolant flush?

Technically you should also pull a coolant plug from the engine block. Then refit with a new crush washer. I forget which side of the engine is easier to get to.


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