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Author Topic: Fan Not Turning On  (Read 7396 times)

Offline 85-K100-Cafe

  • Motobrick Curious
  • Posts: 26
Fan Not Turning On
« on: July 24, 2017, 09:03:02 PM »
Hello,


The fan on my 1985 K100RT isn't coming on. I let the bike idle for 10-15 minutes and it did not turn on. All the fuses on the motorcycle are good. Is there a way to pinpoint the issue between the temp sensor, temp relay or a bad fan? I am trying to figure out how can i test each individual part to nail down the issue.


Thanks
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  • New Haven, CT
  • 1985 BMW K100

Offline Laitch

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Re: Fan Not Turning On
« Reply #1 on: July 25, 2017, 05:23:20 AM »
Quote from: 85-K100-Cafe on July 24, 2017, 09:03:02 PM
The fan on my 1985 K100RT isn't coming on.
Does the overheat indicator bulb light during that interval? Has it ever lit?
http://www.motobrick.com/index.php?topic=5045.0
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  • Along the Ridley in Vermont.
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Offline rbm

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Re: Fan Not Turning On
« Reply #2 on: July 25, 2017, 05:25:01 AM »
Can you easily spin the fan blades by hand?  It's possible that the fan is seized and needs replacing.
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  • Regards, Robert
Toronto, Ontario

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Offline johnny

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Re: Fan Not Turning On
« Reply #3 on: July 25, 2017, 09:47:12 AM »
greetings...

1st thing i do is jumper 12v to the fans under tank connector to make sure its running and i feel for air flow...

sometimes the motor runs butts blade donts turn...

process of elimination... i go fan 1st and work backwards to relay 2nd and sensor 3rd...

butts im betting it didnt getts hot enough to trigger the fan in that time frame...

j o
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  • :johnny i parks my 96 eleven hundert rs motobrick in dodge county cheezconsin  :johnny

Offline 85-K100-Cafe

  • Motobrick Curious
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Re: Fan Not Turning On
« Reply #4 on: July 25, 2017, 10:53:27 AM »
Quote from: Laitch on July 25, 2017, 05:23:20 AM
Does the overheat indicator bulb light during that interval? Has it ever lit?
http://www.motobrick.com/index.php?topic=5045.0

I bought the K as the previous owner was converting the bike into a "café racer" so it doesn't have the factory gauge cluster.
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  • New Haven, CT
  • 1985 BMW K100

Offline 85-K100-Cafe

  • Motobrick Curious
  • Posts: 26
Re: Fan Not Turning On
« Reply #5 on: July 25, 2017, 10:54:08 AM »
Quote from: rbm on July 25, 2017, 05:25:01 AM
Can you easily spin the fan blades by hand?  It's possible that the fan is seized and needs replacing.

I can spin the fan blade freely by hand
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  • New Haven, CT
  • 1985 BMW K100

Offline 85-K100-Cafe

  • Motobrick Curious
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Re: Fan Not Turning On
« Reply #6 on: July 25, 2017, 10:55:19 AM »
Quote from: johnny on July 25, 2017, 09:47:12 AM
greetings...

1st thing i do is jumper 12v to the fans under tank connector to make sure its running and i feel for air flow...

sometimes the motor runs butts blade donts turn...

process of elimination... i go fan 1st and work backwards to relay 2nd and sensor 3rd...

butts im betting it didnt getts hot enough to trigger the fan in that time frame...

j o

How do I jump the 12v to the fan under the tank connector?
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  • New Haven, CT
  • 1985 BMW K100

Offline johnny

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Re: Fan Not Turning On
« Reply #7 on: July 25, 2017, 11:37:06 AM »
greetings...

disconnect fan side from loom side... jumper wior from + to connector and jumper wior from - to connector...

j o
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  • :johnny i parks my 96 eleven hundert rs motobrick in dodge county cheezconsin  :johnny

Offline 85-K100-Cafe

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Re: Fan Not Turning On
« Reply #8 on: July 25, 2017, 12:13:16 PM »
Quote from: johnny on July 25, 2017, 11:37:06 AM
greetings...

disconnect fan side from loom side... jumper wior from + to connector and jumper wior from - to connector...

j o

Thanks, will try this tonight
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  • New Haven, CT
  • 1985 BMW K100

Offline jakgieger

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Re: Fan Not Turning On
« Reply #9 on: July 25, 2017, 05:22:51 PM »
This thread contains the wiring info that may be useful...scroll up for testing options.
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  • Kansas USA
  • 1989 K100rs se
"What we've got here is failure, to communicate.  Some men, you just cain't reach.  So you get what we had here last week.  Which is the way he wants it...Well, he gets it.  I don't like it any more than you men do."
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