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Offline Alan

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Adding coolant
« on: April 14, 2019, 05:45:16 PM »
Finally got around to adding coolant as it was well below the minimum mark.  So the question is, how are you supposed to do it?  There is no way to add coolant directly to the expansion tank and the connecting hose is only a couple of mm below the top of the filler neck.  The only way I could do it was to slowly pour water into the neck whilst sucking on the overflow pipe to draw the coolant into the expansion tank.  I am sure there must be a better way, but I couldn't find one

Online SimonUK

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Re: Adding coolant
« Reply #1 on: April 14, 2019, 05:49:14 PM »
Remove the side panel. Or use a syringe, difference between min and max is about 100ml.

Offline Alan

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Re: Adding coolant
« Reply #2 on: April 14, 2019, 06:46:00 PM »
I had the side panel off to get at the filler cap and the expansion tank.  I assume that when you say use a syringe it is through the overflow hose which is the one I was sucking on to lower the pressure in the tank and draw the coolant through.  It was well below minimum, just a little bit right at the bottom of the tank so I filled it half way between the min and max marks. 

Online SimonUK

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Re: Adding coolant
« Reply #3 on: April 14, 2019, 07:37:40 PM »
I guess I am not understanding you then. The white tank is an expansion tank, it is not under pressure, if the side panel is off just top it up through the top after removing the rubber stopper(with the overflow tube in it).

Offline Alan

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Re: Adding coolant
« Reply #4 on: April 14, 2019, 07:55:52 PM »
I didn't notice that there was a removeable bung in the expansion tank where the overflow tube enters, so that's the answer, although my method did work OK

Offline nrthrnbkr

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Re: Adding coolant
« Reply #5 on: April 14, 2019, 10:22:36 PM »
*Originally Posted by SimonUK [+]
Remove the side panel. Or use a syringe, difference between min and max is about 100ml.

I found that is the best method as per Simon  - I have a large plastic syringe and just topped up with deionised/distilled water - took about 30-40cc (to move from above the low mark to around 2/3rds between markers.

I just passed it through the overflow tube which was really easy. Hope all is sorted.
« Last Edit: April 14, 2019, 10:23:56 PM by nrthrnbkr »

Offline MA413

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Re: Adding coolant
« Reply #6 on: April 15, 2019, 06:48:25 PM »
i just pulled the cap with tube off the expansion tank ("overflow") and added some distilled water.  i did pull the side panel cowl to get to it.  my cap wasn't secure completely on the rad which resulted in a fluid puke session in the driveway at idle. :151:
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Offline bm55gav

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Re: Adding coolant
« Reply #7 on: April 16, 2019, 12:16:15 AM »
Still problems with the coolant ? Got my expansion tank replaced under warranty on my 2014 bike and never had to top up since. Why still a problem on newer bikes ?

Offline MarketSquareHero

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Re: Adding coolant
« Reply #8 on: April 16, 2019, 12:37:54 PM »
Same here but that's probably not the issue Alan has.
Well,I hope not after all this time.

Offline Alan

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Re: Adding coolant
« Reply #9 on: April 16, 2019, 03:58:30 PM »
I bought the bike last September as an Approved Used BMW.  It should have had a full check before being delivered, however, they neglected to check the coolant level which was well below the minimum mark.  There was just a drop right at the bottom of the expansion tank, but the radiator was full to the filler cap.  As I don't ride in winter I was just getting it ready for riding and so topping up the coolant.  Time will tell if there is a problem, fortunately it came with a full 2 year warranty

 


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