Radiators fans starting too soon - BMW Luxury Touring Community
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post #1 of 11 Old Nov 9th, 2016, 10:33 am Thread Starter
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Radiators fans starting too soon

Hello,

On my 2006 LT, the fans begin to run as soon as the temp indicator reaches 3/4 of the dial.
It happens only in slow traffic and it is not a big issue but presently the tupperware are off for the winter maintenance so I consider changing the sensor.
I know the are several temp sensors.
Questions:
Which one controls the fans ?
Is it difficult to reach and to change it?

Thanks in advance

Bruno

Bruno_C
K1200 LT 2006 85000km
Moto Guzzi Breva 750 2004
Triumph Bonneville 1972
Norton Commando 1976

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post #2 of 11 Old Nov 9th, 2016, 11:14 am
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Re: Radiators fans starting too soon

3/4 sounds like they're starting late, mine come on at a little over halfway, and I like it like that!
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post #3 of 11 Old Nov 9th, 2016, 11:16 am
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Re: Radiators fans starting too soon

Quote:
Originally Posted by bruno_c View Post
Hello,

On my 2006 LT, the fans begin to run as soon as the temp indicator reaches 3/4 of the dial.
It happens only in slow traffic and it is not a big issue but presently the tupperware are off for the winter maintenance so I consider changing the sensor.
I know the are several temp sensors.
Questions:
Which one controls the fans ?
Is it difficult to reach and to change it?

Thanks in advance

Bruno
Bruno, that doesn't sound too far off normal unless your bike runs that warm while at speed. The fans are supposed to cut in at 105C or 221F ( warning light at 115C 239F ) so if you can get a GS911 to hook up and read the temp when the fans cut on, you might be able to tell if the sensor is bad or reading incorrectly. The water temp sensor is at the bottom front of the engine facing to the left. Be very careful if you replace it as it is only tightened to 9 Nm and can be broken easily if you try to over tighten. It feels like almost nothing at 9 Nm.

Gordon
Sugar Hill, GA
2001 K1200LTI Champagne (current ride) Lazy Susan
1998 R1100RT Never should have sold it
1974 Yamaha TX 750 Twin. Omni Phase Balanced


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post #4 of 11 Old Nov 9th, 2016, 6:53 pm
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Re: Radiators fans starting too soon

The water temp sensor that turns the fans on is at the rear of the cylinder head. The water temp sensor at the water pump runs just the temp gauge.
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2004 Black LT
2000 Canon Red LT



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post #5 of 11 Old Nov 9th, 2016, 8:26 pm
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Re: Radiators fans starting too soon

Normal for the 05 and up. The pre 05 fans don't kick in until just before the gauge goes into the red. Either way the fans always kick in at the same temperature, just the gauges are different.
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post #6 of 11 Old Nov 9th, 2016, 8:34 pm
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Re: Radiators fans starting too soon

Mine goes on at about . I also have an 06. I think that's where they are supposed to come on.


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post #7 of 11 Old Nov 9th, 2016, 10:44 pm
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Re: Radiators fans starting too soon

Quote:
Originally Posted by saddleman View Post
The water temp sensor that turns the fans on is at the rear of the cylinder head. The water temp sensor at the water pump runs just the temp gauge.
Thanks Dave, I think i had heard that before but I don't take my Clymer to work with me to do any looking and didn't remember there was a separate sensor.

Gordon
Sugar Hill, GA
2001 K1200LTI Champagne (current ride) Lazy Susan
1998 R1100RT Never should have sold it
1974 Yamaha TX 750 Twin. Omni Phase Balanced


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post #8 of 11 Old Nov 10th, 2016, 7:04 am
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Re: Radiators fans starting too soon

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Originally Posted by bmwcoolk1200 View Post
Thanks Dave, I think i had heard that before but I don't take my Clymer to work with me to do any looking and didn't remember there was a separate sensor.
See this older post with pictures link for more info on these 2 separate temperature sensors. Click on each picture for more text info below each one:
http://www.bmwlt.com/forums/k1200lt/...ml#post1325834
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post #9 of 11 Old Nov 10th, 2016, 7:55 am
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Re: Radiators fans starting too soon

Quote:
Originally Posted by sailor View Post
See this older post with pictures link for more info on these 2 separate temperature sensors. Click on each picture for more text info below each one:
http://www.bmwlt.com/forums/k1200lt/...ml#post1325834
Good write up John, thanks.

Gordon
Sugar Hill, GA
2001 K1200LTI Champagne (current ride) Lazy Susan
1998 R1100RT Never should have sold it
1974 Yamaha TX 750 Twin. Omni Phase Balanced


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post #10 of 11 Old Nov 10th, 2016, 9:36 am
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Re: Radiators fans starting too soon

As long as engine isn't overheating and fans kick on consistently it doesn't sound bad really. I prefer my engine to stay out of the red, as long as im there I don't sweat it much.
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post #11 of 11 Old Nov 10th, 2016, 2:48 pm Thread Starter
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Re: Radiators fans starting too soon

Thank you everybody for your advice.
I was a bit worried because I read in some older posts that the fans should not start before the temp gauge reaches nearly the top of the dial.
I understand from your answers that my bike's behaviour is normal for a 2006 model.
So I will let the sensor alone and finish the winter maintenance as usual.
Thanks again

Bruno

Bruno_C
K1200 LT 2006 85000km
Moto Guzzi Breva 750 2004
Triumph Bonneville 1972
Norton Commando 1976

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