BMW K bikes (Bricks)

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1Back to top Go down   Fan trouble shooting Empty Fan trouble shooting on Mon Nov 19, 2012 5:42 pm

MT350Explorer

MT350Explorer
Life time member
Life time member
Hi Guys,

The fan does not appear to be cutting in when it should. In the pic below is the temp gauge. In normal motion the needle is straight up so I assume it is probably working OK. If i leave the bike idling the temp rises. It has got as far as where I have marked the gauge in yellow before I turned the engine off or went for a ride to cool it down - for fear of damaging the engine. I am assuming the fan should have kicked in before this?

Fan trouble shooting Temp_g10

I have taken off the fairing and accessed the connection to the temp sensor beneath the bottom of the rad; it snicks into place and seems to connect OK. I cleaned it with Deoxit and left well alone. Also cleaned the connection under the tank.

I've just put 12 volts directly through the fan at the connection under the tank - and it works! Great, no new fan needed. The fuse is also fine - cleaned and wiggled all the fuses with Deoxit.

Advice on my next step please. Remove the temp sensor?

Thanks as always Very Happy
Dave


__________________________________________________
1991 K100 RS 16 valve
    

2Back to top Go down   Fan trouble shooting Empty Re: Fan trouble shooting on Mon Nov 19, 2012 6:17 pm

robmack

robmack
Life time member
Life time member
Hi,

This is quite a common problem and questions about the troubleshooting procedure come up from time to time. The following previous responses might help you along the way to a diagnosis:

http://www.k100-forum.com/t4287-cooling-fan-fuse-location-and-fan-testing

http://www.k100-forum.com/t4093-overheating

http://www.k100-forum.com/t4462-cooling-system-issues


These are just a few links that came up under a search. You might find other useful information in the Motobrick forum. Duck does a great job of documenting common procedures with the K-bikes. You have yet to eliminate the fan relay as the culprit and, since it is a complex circuit rather than a simple relay, the issue might well lie in that component. It is often vibration that cause solder joint failure that leads to overheating and fan issues.


__________________________________________________
Robert
1987 K75 @k75retro.blogspot.ca
http://k75retro.blogspot.ca/
    

3Back to top Go down   Fan trouble shooting Empty Re: Fan trouble shooting on Mon Nov 19, 2012 6:44 pm

krambo

krambo
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Life time member
I have had this issue on both of my K's and in both cases it turned out that the fan was seized and would not turn easily or at all. The method to check this is to use a stick or a long screwdriver through the fairing vents to see if the fan spins freely or not. I replaced the fan unit on both of my bikes and regularly spray the fan bearing with GT85 or WD40 or similar. I have had no issues since - hope this helps Wink


__________________________________________________
1984 BMW K100RT, 1993 BMW K1100LTIC,1982 Kawasaki KZ1100 Spectre
"Aut viam inveniam aut faciam." Fan trouble shooting Uk-bmw12
http://www.its-personal.net
    

4Back to top Go down   Fan trouble shooting Empty Re: Fan trouble shooting on Mon Nov 19, 2012 6:52 pm

GerryP

GerryP
Silver member
Silver member
Hi Dave,

That's exactly where my fan kicks in. Try giving it just a little bit longer.

Fan should start and stay on until temp is reduced to normal.


__________________________________________________
Safe riding Cool,
Gerry Parnham


K1100LT (1993) in Silk Blue/Cream
http://gerryparnham.com
    

5Back to top Go down   Fan trouble shooting Empty Re: Fan trouble shooting on Mon Nov 19, 2012 7:35 pm

Inge K.

Inge K.
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VIP
@GerryP wrote:Hi Dave,

That's exactly where my fan kicks in. Try giving it just a little bit longer.

Fan should start and stay on until temp is reduced to normal.

+1...on my K11 the fan kicks in even later, just a tad before the needle enters the red field.

To check that the relay functions, disconnect the Motronic connector and ground contact # 16.


__________________________________________________
Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

6Back to top Go down   Fan trouble shooting Empty Re: Fan trouble shooting on Mon Nov 19, 2012 7:41 pm

RicK G

RicK G
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Mine is the same as Inge's just before the red.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

7Back to top Go down   Fan trouble shooting Empty Re: Fan trouble shooting on Tue Nov 20, 2012 3:24 am

MT350Explorer

MT350Explorer
Life time member
Life time member
Thanks Guys for all teh answers. First step I'll let the engine get a bit hotter and seee if it works!

Cheers
Dave


__________________________________________________
1991 K100 RS 16 valve
    

8Back to top Go down   Fan trouble shooting Empty Re: Fan trouble shooting on Fri Nov 23, 2012 4:59 pm

K-BIKE

avatar
Life time member
Life time member
Hi Dave,
I suggest you have a poke with a wooden stick and make sure the fan blades turn because if it is jammed you are just wasting fuel, if it's jammed it isn't going to start Crying or Very sad Once you know it turns freely then go ahead and do your warm up test.
Regards,
K-BIKE

    

9Back to top Go down   Fan trouble shooting Empty Re: Fan trouble shooting on Fri Nov 23, 2012 5:03 pm

Ringfad

Ringfad
Life time member
Life time member
I also have suffered from seized fans on 2 of my K's - use that stick first.


__________________________________________________
Fan trouble shooting Ir-log10

   ;BMW; K100RS Style Black 1987 105K Km     ;BMW; K1 Black 1993 51K Km     ;BMW; K1100RS Red 1993 70k miles  ;BMW; K100 16V Black (ex ElectricMonk)  ;BMW;  K1100LT (Swiss) soon to be an RS
    

10Back to top Go down   Fan trouble shooting Empty Re: Fan trouble shooting on Fri Nov 23, 2012 5:09 pm

Ringfad

Ringfad
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Life time member
I have just read the the beginning of your post again and realised the fan is working after you powered it up, so stick won't help, one of my K's only kicked in the Fan when it hit the Red on the temp. gauge you may need to let it warm up a bit more


__________________________________________________
Fan trouble shooting Ir-log10

   ;BMW; K100RS Style Black 1987 105K Km     ;BMW; K1 Black 1993 51K Km     ;BMW; K1100RS Red 1993 70k miles  ;BMW; K100 16V Black (ex ElectricMonk)  ;BMW;  K1100LT (Swiss) soon to be an RS
    

11Back to top Go down   Fan trouble shooting Empty Re: Fan trouble shooting on Fri Nov 23, 2012 5:35 pm

MT350Explorer

MT350Explorer
Life time member
Life time member
Yeah thanks Guys. The fan is working I probably just haven't had it hot enough for it to work! I didn'yt want to cook the engine and thought it woukd have clicked in by 75% but I guess it might click in higher up the temp range Very Happy. Still , now I've broken my water temp sensor connector while changing the oil/water pump seals I might well be in blissful ignorance for some time to come!


__________________________________________________
1991 K100 RS 16 valve
    

12Back to top Go down   Fan trouble shooting Empty Re: Fan trouble shooting on Fri Nov 23, 2012 6:34 pm

charlie99

charlie99
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bugga dave ....oh well ! we learn new stuff i guess .


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OFan trouble shooting Au-log10

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
    

13Back to top Go down   Fan trouble shooting Empty Re: Fan trouble shooting on Fri Nov 23, 2012 7:16 pm

japuentes

japuentes
Life time member
Life time member
@GerryP wrote:Hi Dave,

That's exactly where my fan kicks in. Try giving it just a little bit longer.

Fan should start and stay on until temp is reduced to normal.

So do mine
Best regards
JAP


__________________________________________________
Fan trouble shooting 2854237993 1988 K100RS SE/ABS
    

14Back to top Go down   Fan trouble shooting Empty Re: Fan trouble shooting on Mon Dec 15, 2014 9:07 pm

Mark K Boy

Mark K Boy
Gold member
Gold member
http://www.k100-forum.com/t1751-k100-cooling-fan-problem#108416


The above Mod works beautifully.

I can do traffic now...... Fan trouble shooting Icon_biggrin 


Enlarge this image
Fan trouble shooting 73f1b74c3ce549befb0de19cbcb25d0e


__________________________________________________
Mark Surman
Keep the shinny side up !

Fan trouble shooting Au-log12
http://www.marksurman.com
    

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