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Discussion Starter #1 (Edited)
Hi everyone
I am new to this forum, I just bought this bike, and I have an issue, the Bike runs great, it does not over heat, like I ran the bike for about 20-25 mins in center stand, it never went over mid way on the gauge (2 bars ) . And the fan comes on and off, now the here is issue, when the fan comes on the coolant starts coming out of drain line on the expansion tank line, and as soon as the fan stops, the coolant stop coming out of expansion drain line!!! , there is what I know the previous owner recently replaced the radiator with used one ( the new cost around $1000 !!!) , this was prior to my purchase, and when I called his indy shop, trying to find out the issue I was told there is possibility radiator is wrong one for the bike or blown head gasket ! Well the part number on radiator is 7 690 643 35/2007 , I called local BMW dealership , and the radiator for K12 and K13GT are the same, so assumption of wrong radiator I don't believe is correct, and as far as blown head gasket, I did not see any oil in coolant or coolant in oil, and when bike was running there is no smokes coming from pipe, and the fact that bike ran for 25 min without overheating let me believe the head gasket should be ok. So either the used radiator is defective although there is no evidence of leaks, but it could be flow issue????? Radiator cap issue??? Thermostat problem??? water pump ??? Air trapped in system???

Like As I said the gauge stays at two bar(in middle) So not sure why I am losing coolant when the fan kicks in? So any input will be much appreciated.
 

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I would start with test system for leaks. Requires vacuum equipment, around $30 on ebay and a compressor.

Empty the system from coolant and plug off the drain under the bike, pinch off the thin line going from radiator cap to expansiontank.
Then draw a vacuum, it should hold negative pressure unchanged for at least 5 minutes.

If all good, i would pull the thermostat and test it in boiling water on the stove, measure temp and see when it opens and shuts.

Most likely is the thermostat being bad or incorrectly installed. Reason it pours when fan kicks in is that that is when engine is warmest. I would also test the tempgauge, either could be bad or there is air that makes it read wrong.

This engine NEED to be filled with vacuum method, it is sensitve and no matter what some dumbasses say, IMPOSSIBLE to bleed the system from air without it. Doing this wrong can cause local spots where it overheats with risk of cracks.

Contact the shop and ask what method they used for refilling the coolant, also ask what exact brand and type of coolant used, bmw engines MUST use NAP free coolant, specification for bmw motorcycles is BMW GS94000.
Do not confuse this with Bmw N600.69 0 wich is for bmw cars that have different alloys in engine thus need different corrossionprohibitors.
 

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Discussion Starter #3 (Edited)
Thank you Mattias_r , for your input, funny thing is I did order vacuum equipment for Ebay I guess I was on right track , I should get it today. what you said it make sense , I was sort of thinking the same thing, quick question , you said I should also test a tempgauge, how can I test it? do you mean them sensor on the engine block? again thank you
 

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I remember from another forum, that someone accidentally swapped the radiator cap with the expansion tank cap and his bike was pissing fluid when hot.

Your bike is a 2007 bike. So the radiator cap would be without a spring.
Your expansion tank cap should have a spring on it.

And yes, the part number from the radiators are the same for a K12/K13.
But the radiator caps have two versions depending on the cooling system type.
The shop could have bought an 05-06 radiator and unknowingly installed the wrong radiator caps.

An 05-06 system is the non flow through expansion tank setup. (The coolant fluid is not being recirculated through the expansion tank)
From late 06-present day the system was changed so that the fluid is now fully circulated through the expansion bottle.

First photo is an 05-06 system
Round bottle cap, and a radiator cap with spring.

Second photo is 07-present.
Bottle cap with spring, and a radiator cap with no spring.
 

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Discussion Starter #5 (Edited)
Thank you Partriqe83 for the heads up, but from sticker the rad is 2007 and the caps looks like correct see the photos, there is two different radiator cap was made for that radiator P/N 17117695413 which has no Bar indication mark on the cap and Expansion tank Part is P/N 17117687715 which has 1.8 Bar indication mark on the cap according to BMW dealership, and thermostat PN is 17111464975

As Mattias_r direction is more logical but one never know if radiator cap is failing could cause it? any more suggestion? thanks






 

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Discussion Starter #7 (Edited)
Thank you Capt howdy I am waiting to some tools that I ordered to come in today , and will pressure test the system and also test the thermostat as Mattias_r said in boiling water to see it works or not!! I want fix it right way , rather throw parts at it

BTW there is link short video I made as you can see as soon as fan kicks in starts spitting coolant and when fan stops the coolant stop come out of drain line!!!! .

https://youtu.be/yjY1Yszo82w
 

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Discussion Starter #8 (Edited)
Update
I think I found the problem thanks to direction of Mattias_r and Capt howdy I think the problem is thermostat, (I removed it also Plastic housing) and put it boiling water the needle moved little (which I think that means it opened), but when I put in cold water for about 3-5 min, the needle it does NOT retract stay in the same position !!! so I also tried pushed the needle by force which it did retract , and then put it boiling water, again it did expand , and with cold water nothing stay the same position, so I can only assume it is bad thermostat , today being Sunday, the dealership in my area , is closed Sunday and Monday, so I have to get on Tuesday, Also still waiting to get tool that I ordered from eBay so I can pressurized the system for my piece of mind, so stay tuned!!!

BTW can anyone tell me the radiator holds how many litters of coolant? thanks

 

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Discussion Starter #11
UPDATE UPDATE
Well guys it was the thermostat after all!!!!!! NOW it fixed and "Schnurren Wie Enine Katze" and in english "Purring like a Cat!!!" Now to the Next fix which fuel Strip fix!!!!

Thank you to all your inputs!!!
 

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Got luck with the fuel strip fix.
Did you get your cooling system pressurized? Just curious on how you did it.
du907
 

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Discussion Starter #13 (Edited)
Hi Du907, I bought "Engine Radiator Cooling System Vacuum Purge Refill Kit Set Universal Auto Tools" from eBay for $40 and using compressor pressurized the system and it hold the pressure for 10 min and connect coolant side and sucked the coolant into radiator. and then bled the system of air and then start the bike to see fan cycled on and off and let it cool and check the coolant level again, and take bike for ride !!! I had to do it couple time to get air out !!! if you don't air out of system fan continues to run and bike overheats.

Although service manual explains this I found this video explains really good, Even although this is for K1300GT it same for K1200GT

BTW I bought the same tools works great and it is cheap at $40 I am sure to change coolant at dealership would be lot $$$$$$

 

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That video is absolut rubbish.

The hose needs to be filled completely with antifreeze before you open the valve.

The antifreeze canister needs to be hanging higher then the radiator.

The „up high“ canister will let the fluid syphon into radiator once you crack open the bleed screws, pushing out the last remaining air pockets.

And to top off the bullshit way of him showing it: The small hose from the radiator neck going to the expansion tank needs to be clamped off too, because not all vaccum tools are shaped in such a way that the line is blocked off automatically......

So anyone watching this video, be carefull!!!
 

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Discussion Starter #15
Patrique83 Yes you are correct , but I did followed factory service manual and I did clamped off the both hose from radiator and drain hose and I did elevate the coolant bottle and I was able to fill line almost full, in my case. Even with all said, it will take few time to get air out!!!!

But the question was "How cooling system is pressurized" and this video shows how, and how to use the tool, I did find this video and factory service manual combined helpful. Like any thing on internet you have to your home work!!!
 

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