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Offline nrthrnbkr

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Re: Coolant leak
« Reply #10 on: March 11, 2019, 08:34:10 AM »
I ended up with coolant leaking past the cap after a service - I just topped up a few mil with distilled water, took the cap off and re-fastened it - seemed to do the trick. Looking at the forum though there are various coolant link issues - From The Rad Cap, From The Coolant Reservoir Overflow and from the Water Pump Seal - so is always best to check out all options- lots of really useful info on all of these on the forum.     

Offline MA413

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Re: Coolant leak
« Reply #11 on: March 11, 2019, 11:10:18 AM »
I think Ill go the distilled route and play it safe.  I appreciate the input.
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Offline beech

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Re: Coolant leak
« Reply #12 on: March 13, 2019, 05:52:20 PM »
Don't use "good old antifreeze" either use BMW OEM or go to a NAPA auto store and buy Pentosin NF, it is the same product and also blue. This goes for all BMW bikes.
There used to be a kit for the older overflow bottles that just had a hole, Consisted of a hose. Just find some rubber auto type hose that is a tiny bit larger than the hole so it will snug in and lead it up a foot and tie wrap it off. Or buy the new style tank. And yes one fastener is normally missing.

Offline MA413

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Re: Coolant leak
« Reply #13 on: March 13, 2019, 06:07:25 PM »
*Originally Posted by beech [+]
Don't use "good old antifreeze" either use BMW OEM or go to a NAPA auto store and buy Pentosin NF, it is the same product and also blue. This goes for all BMW bikes.
There used to be a kit for the older overflow bottles that just had a hole, Consisted of a hose. Just find some rubber auto type hose that is a tiny bit larger than the hole so it will snug in and lead it up a foot and tie wrap it off. Or buy the new style tank. And yes one fastener is normally missing.
I appreciate the heads up.  I ended up filling the over flow bottle with distilled water as nrthrnbikr suggested to play it safe.  Took her for a spin and not leaks that Im aware of.  Fan kicked in at 208F so I couldnt see a reaction @212F IF it was to boil over will sitting idle.  I do have the overflow bottle with cap and tube thankfully so all is good. 
17S1KR

Offline Stellar

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Re: Coolant leak
« Reply #14 on: March 18, 2019, 11:10:13 AM »
I had the same problem on my 2014 when she was only 12 mnths old, fluid leaked down the outside of the hose, radiator cap from memory.

Never happened since, regularly run around 103 deg c in city work in summer, 30 c day and quickly cools back to around 74 c on the open road .

You should never mix coolants, out here we have red or green, if you mix them you will end up with a radiator full of " porridge " 
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Offline MA413

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Re: Coolant leak
« Reply #15 on: March 18, 2019, 11:18:49 AM »
Thankfully, no issues since topping it off with distilled water.  Still cant figure how the cap came loose.  Glad I caught it before it got worse.
17S1KR

Offline MrVerceti

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Re: Coolant leak
« Reply #16 on: March 22, 2019, 01:45:31 AM »
Same thing happened to me. Checked the radiator cap and this happened.

https://streamable.com/7qunm


Offline MA413

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Re: Coolant leak
« Reply #17 on: March 22, 2019, 11:04:39 AM »
*Originally Posted by MrVerceti [+]
Same thing happened to me. Checked the radiator cap and this happened.

https://streamable.com/7qunm
Thats it!  I hope this isnt a common problem.  Ill tether the cap if it happens again.
17S1KR

Offline 1964Hall

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Re: Coolant leak
« Reply #18 on: March 22, 2019, 06:42:53 PM »
Possibly caused by overfilling after previous blow out caused by air lock?
Or dodgy rad cap seal allowing boiling water at lower temps?
\v/
« Last Edit: March 22, 2019, 06:43:50 PM by 1964Hall »
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