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Hi...I have read many posts on this subject and after more overheating issues have decided to build an engineered solution.The radiator fouling is understood, but the ongoing overheating issues persist in crawling traffic and slow speed high load situations.My bike has had an issue since approx 5k and it’s well over 20k now. In the U.K. it seems fine but on the continent away it goes.....in June I was almost at the top of the Stelvio and in came the red flashing warnings. The radiator is a compromise and appears the same frontal area as all the the 1000 1200 1300 and now 1600......the fan comes on too late to be effective in high heatload situations. The radiator was cleaned 3x prior to this years European trips ( once as part of the 28k service)..fluid changed, engine burped...levels all fine.
All in an effort to address the overheating.....but it still overheated.
So it needs an engineering solution....an additional fan....I have bought all the necessary parts and will be fitting it this winter....it will run on its own micro processor thermostat (couple of pounds from China) and will come in when the 6th bar indicates at 207 deg F thats 20 deg F before the main fan. The second fan will operate independent of the main cooling system which will allow fine tuning.
BMW are unwilling to enter into any dialogue on this, which is a shame dealers are none the wiser but Kawasaki had a similar issue on there big bikes and in short order fitted and additional fan.....and fixed the problem.
A further consideration is to mount a fan behind the oil cooler. .....but that’s for another day.
 

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Hi...I have read many posts on this subject and after more overheating issues have decided to build an engineered solution.The radiator fouling is understood, but the ongoing overheating issues persist in crawling traffic and slow speed high load situations.My bike has had an issue since approx 5k and it’s well over 20k now. In the U.K. it seems fine but on the continent away it goes.....in June I was almost at the top of the Stelvio and in came the red flashing warnings. The radiator is a compromise and appears the same frontal area as all the the 1000 1200 1300 and now 1600......the fan comes on too late to be effective in high heatload situations. The radiator was cleaned 3x prior to this years European trips ( once as part of the 28k service)..fluid changed, engine burped...levels all fine.

All in an effort to address the overheating.....but it still overheated.

So it needs an engineering solution....an additional fan....I have bought all the necessary parts and will be fitting it this winter....it will run on its own micro processor thermostat (couple of pounds from China) and will come in when the 6th bar indicates at 207 deg F thats 20 deg F before the main fan. The second fan will operate independent of the main cooling system which will allow fine tuning.

BMW are unwilling to enter into any dialogue on this, which is a shame dealers are none the wiser but Kawasaki had a similar issue on there big bikes and in short order fitted and additional fan.....and fixed the problem.

A further consideration is to mount a fan behind the oil cooler. .....but that’s for another day.


Any luck with a simple fix or solution?


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KBiK
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They don’t all overheat. My 1600 never has never over heated ever in very hot conditions. Cleaning the radiator and a fender extender is the answer. This my 2nd K1600 and never an issue.
I thought the same until I took my K1600GTS to Alaska. Ride a few dirt roads and you'll see the overheating. I have had a fan replaced but I still see high engine temperatures after spirited riding or on 85+ degF days. :surprise:>:)

PS. I have a fender extender and regularly clean my radiator.
 
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Before I crashed my k16 I was investigating ways to improve the cooling in the k16.

I had considered adding active cooling fans to the oil cooler intake and looking at a third party solution to the radiator. The 16's problem is one of isolation when it comes to parts, there's tons of options for the S1000 and the R series but K bikes are left out in the cold so to speak when it comes to parts options.

Some of you may have air trapped in your coolant lines but I put enough miles on the k16 to know the cooling works but under extreme conditions, it could use some improvement. Waiting on BMW to do it is going to be a very long wait.
 

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If you ride in very high temps and city type traffic you can see the overheat. The fan will never stop but is that what the K1600 was designed for or is it a touring /sport touring bike?

The stock radiator is it a single pass unit anyone know?
 

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....
So it needs an engineering solution....an additional fan....I have bought all the necessary parts and will be fitting it this winter....it will run on its own micro processor thermostat (couple of pounds from China) and will come in when the 6th bar indicates at 207 deg F thats 20 deg F before the main fan. The second fan will operate independent of the main cooling system which will allow fine tuning.
BMW are unwilling to enter into any dialogue on this, which is a shame dealers are none the wiser but Kawasaki had a similar issue on there big bikes and in short order fitted and additional fan.....and fixed the problem.
A further consideration is to mount a fan behind the oil cooler. .....but that’s for another day.
Sounds like an elegant solution to a fairly common issue. Probably not patentable, but even so you might be able to make up kits and sell them to enough K16 owners to make it worthwhile. Talk to RL about selling his inner oil sump plug.
 

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Seems like a simple solution would be to kick the fan on sooner. That would be a simple software update. Bet Bren Tuning could do it?

My 18 B has yet to be a issue, that said, the fan doesn't kick on till the temp bar is pretty high. I suspect that BMW wants them to run on the Hot side to meet emissions.

Another option would be a higher output fan. There is a cheap used fan setup off a 18 K1600BGA on eBay. Would make experimentation easier.

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Those suffering with the cooling issue will be fully aware that it is largely down to their biking lifestyle, always accepting that good housekeeping makes sure the rad is kept scrupulously clean.

Take a K16 up a high mountain road, with slow hairpins & steep gradients & I suspect most will throw the red light & ask for a cool off half way up. Similarly, after a long blast at high speed, coming into a town & getting caught in traffic can create a similar scenario. It's the nature of the beast; after all, there is only 5mm between each cylinder, so no room for coolant between the pots. Clearly BMW optimised the size of the rad, so a twin fan set-up seems entirely logical to me; anything to dissipate heat & draw more airflow across the rad at low speed.
 

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So it needs an engineering solution....an additional fan....I have bought all the necessary parts and will be fitting it this winter..../QUOTE]

Steve, I assume you will mount the additional fan on the front of the radiator. What size fan did you get?

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Any luck with a simple fix or solution?


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Yes, fan eventually fitted.....went with the simplest solution....push button switch and fan mounted on the top of the stone guard.....
It all fits .....it works well......not had chance to test this as yet with lock down....
Curious thing, last year We toured Southern Italy and Sicily and no issues with cooling.
Its a vexing issue......but radiator cleaning and an additional fan mean I can manage the problem. It would be much better if the factory mounted fan operated at 75 deg C instead of 98 deg C.....and was position where it was not obstructed by the stone guard. It’s poor design......which is a theme running through this bike.....great bike beset with niggles....
 

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Yes, fan eventually fitted.....went with the simplest solution....push button switch and fan mounted on the top of the stone guard.....
It all fits .....it works well......not had chance to test this as yet with lock down....
Curious thing, last year We toured Southern Italy and Sicily and no issues with cooling.
Its a vexing issue......but radiator cleaning and an additional fan mean I can manage the problem. It would be much better if the factory mounted fan operated at 75 deg C instead of 98 deg C.....and was position where it was not obstructed by the stone guard. It’s poor design......which is a theme running through this bike.....great bike beset with niggles....
Hi Steve,

Any chance of a few pics of the install? I'm sure there are more than a few people here interested in how you achieved it and what parts you used.

Cheers

Kev
 

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International Man of Mystery
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Yes, fan eventually fitted.....went with the simplest solution....push button switch and fan mounted on the top of the stone guard.....
It all fits .....it works well......not had chance to test this as yet with lock down....
Curious thing, last year We toured Southern Italy and Sicily and no issues with cooling.
Its a vexing issue......but radiator cleaning and an additional fan mean I can manage the problem. It would be much better if the factory mounted fan operated at 75 deg C instead of 98 deg C.....and was position where it was not obstructed by the stone guard. It’s poor design......which is a theme running through this bike.....great bike beset with niggles....
The change in the opening temperature doesn't do anything if the heat load of the engine cannot be dissipated through the cooling system. If you are lucky it takes a little longer to reach peak temperature or you made it through the low speed high load situation. If you as you suggested set it to 75 C, you could run into the opposite issue that the engine in colder weather conditions never reaches its design operating temperature of 85 + C . So, no a lower opening temperature is not the solution nor is a lower setpoint for the fan. Clean cooler, de-aerated cooling system and no loose nuts behind the bar however is in most instances.

BTW Have you noticed that in modern cars the temp gauge practically never moves from the mid point any more? If so why is that?
 

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BTW Have you noticed that in modern cars the temp gauge practically never moves from the mid point any more? If so why is that?
I'd go one stage further and say that in a lot of modern cars there is NO temp gauge, My 10 year old BMW X5 doesn't have one.
 

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International Man of Mystery
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I'd go one stage further and say that in a lot of modern cars there is NO temp gauge, My 10 year old BMW X5 doesn't have one.
And those cars that have one, show a managed signal which remains on center on purpose. Only if the temperature reaches threshold values it will move towards hot. Our K1600s pretty much show raw data AFAIK. BMW could get rid of the problem easily and only alert the rider when the temps reach the critical maximum short before the expansion tank boils over....Just sayin'
 
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