Cooling fans always on - 99 k1200lt - BMW Luxury Touring Community
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post #1 of 7 Old Jul 11th, 2017, 4:31 pm Thread Starter
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Cooling fans always on - 99 k1200lt

I am in the process of putting my bike back together after replacing my rear main seal. At the point of putting the fuel tank back on, I wanted to let the bike run and put it in gear to make sure there wasn't any strange noises coming from the clutch or transmission. But when I turned the key without starting the bike, both cooling fans are coming on. I've checked fuses, reset montronic, checked coolant temp connection. What is my next check? This is as far as I've ever gone into this bike by myself and it's all because of the help I've received from forums like this that I've even considered tackling a job this large. I'm sure it's something simple that I'm missing.

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post #2 of 7 Old Jul 11th, 2017, 5:16 pm
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Re: Cooling fans always on - 99 k1200lt

Check the temp sensor on the left side attached to the back side of the head behind the coil pack. If that is unplugged or has been damaged, the fans will come on at key on and not turn off. If you failed to unplug it prior to lowering the engine to remove the transmission, that was a $120 mistake as it stretched the cable and damaged the wires. Ask me how I know.
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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 #3 of 7 Old Jul 11th, 2017, 9:55 pm Thread Starter
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Re: Cooling fans always on - 99 k1200lt

Thanks Gordon, I'll check that out. Hopefully, I didn't remember to plug it back in. Terry
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'68 Triumph Bonnie
'71 R75/5 **
'72 R75/5 (2)
'73 R60/5 **
'73 R75/5
'76 R90/6
'77 R75/7 '77 R100/5 "bitsa" bike
'79 R100RT **
'88 R100GS
'90 K75S
'90 K75C **
'99 K1200LT **
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post #4 of 7 Old Jul 12th, 2017, 9:23 am
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Re: Cooling fans always on - 99 k1200lt

You should hope you DID forget to plug it in as then it is an easy fix. That is how I check my fans after I get the bike back together. Unplug they come on plug in they go off.
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post #5 of 7 Old Jul 12th, 2017, 11:19 am
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Re: Cooling fans always on - 99 k1200lt

Found my old thread when doing Cedric's clutch and starter. Here is a picture I took as we went along clearly showing that this cable was not removed before lowering the engine. In any case, this is the plug you need to check.
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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 #6 of 7 Old Jul 12th, 2017, 4:51 pm Thread Starter
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Re: Cooling fans always on - 99 k1200lt

Appears that that sensor was the culprit. From memory, I don't think that I had unplugged it to lift the frame. To look at it, it doesn't appear any worse for wear (crimped or stretched). Luckily, I have a spare parts bike in which I removed that sensor. Other than it was a bear to swap out without removing the coils, everything it working as it should for now. Thanks for all the information.
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'68 Triumph Bonnie
'71 R75/5 **
'72 R75/5 (2)
'73 R60/5 **
'73 R75/5
'76 R90/6
'77 R75/7 '77 R100/5 "bitsa" bike
'79 R100RT **
'88 R100GS
'90 K75S
'90 K75C **
'99 K1200LT **
'99 K1200LT **

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post #7 of 7 Old Jul 12th, 2017, 4:54 pm
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Re: Cooling fans always on - 99 k1200lt

Quote:
Originally Posted by loflyn View Post
Appears that that sensor was the culprit. From memory, I don't think that I had unplugged it to lift the frame. To look at it, it doesn't appear any worse for wear (crimped or stretched). Luckily, I have a spare parts bike in which I removed that sensor. Other than it was a bear to swap out without removing the coils, everything it working as it should for now. Thanks for all the information.
The sensor that I stretched was damaged right where the wire went into the sensor leaving nothing to attempt a repair with. Glad it is all better.

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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