Author Topic: High temp light and fan question  (Read 4283 times)

Offline JcJ TN K75s

  • ^ Motobrick Curious
  • Posts: 77
High temp light and fan question
« on: September 10, 2013, 05:49:18 PM »
Somewhere in a post on here it seems like i remember reading that the high temp light should come on with the ABS, oil prressure and battery lights when the key is on, before the engine is cranked. Mine does not. Wouldn't bother me, but I've never seen it come on at all and wonder about its functionality. That also wouldn't be a big deal, but I have also never seen the radiator fan come on. Ive had this 1993 K75s (which had been dropped at some point) for less than two months, and all my trips have been easy rides (5-8 miles on country roads) but this is not only my first K, but also my first water-cooled motorcycle. So I am in strange territory and not wanting to break anything. Especially since frankenduck has a fan I can afford. :) Thanks from a newb.
  • Lincoln, TN 37334
  • 1993 K75S? "Stormtrooper" 1999 R1100RTP "Lord Vader"
I am quite sure now that often, very often, in matters concerning religion and politics a man’s reasoning powers are not above the monkey’s.- Mark Twain

It could probably be shown by facts and figures that there is no distinctly native American criminal class except Congress.-
Mark Twain

Offline orforester

  • ^ Proficient Motobricker
  • Posts: 220
Re: High temp light and fan question
« Reply #1 on: September 10, 2013, 05:56:56 PM »
Not sure about the light, I am at a wildfire so can't check mine, but you should be able to turn the actual fan blades by hand.  If not you have trouble.  The other thing is run the bike till the temp gets up to almost red line and see if the fan comes on.  DO NOT LET it get into the red thou.  Mine would turn and I too took it on short trips, so never knew any better, then I was stopped in heat and the fan never came on.  Tore it apart and the brush holders on one side had melted and the brushes were ok, but the holder was melted, so I bought a Ducker used fan.  Since then I have learned there is a source for high temp brushes that fit the fans. 

Don't let the temp get too high when testing it. 
Bob
1989 K 100 RS se (SOLD)
1985 K 100 RS, now RT
1979 XS 650 Yamaha Street Tracker
2008 R 1200RT

Offline johnny

  • TrailBrakingThrottleWhacker
  • ^ Quintessential Motobricker
  • Posts: 7652
  • Whacking...n...Chopping Sliding...n...High Siding
Re: High temp light and fan question
« Reply #2 on: September 10, 2013, 06:30:59 PM »
what i do to check fan is... start moto on center stand... wait for fan to kick on... will be able to hear it... listen for it to cycle...

could take 20 or 30 minutes for it to kick on and cycle...

j o



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

Offline wmax351

  • ^ Quintessential Motobricker
  • Posts: 1237
Re: High temp light and fan question
« Reply #3 on: September 10, 2013, 07:04:57 PM »
The temp light does not come on unless the bike is too hot. It doesn't turn on when the key is on, engine off.
  • Albuquerque, NM
  • 91 BMW K75 Standard, 98 Moto Guzzi California EV
Bikes:
Current:1991 BMW K75 Standard, 1998 Moto Guzzi California EV11
Past: '83 BMW R65LS, '75 Honda CB550F, '69 Honda CB175, 1999 Royal Enfield Bullet 500, 1973 Triumph Tiger TR7V, 1971 BMW R75/5 in Toaster outfit, 1979 Harley Davidson XLS-1000 Sportster Roadster

Offline JcJ TN K75s

  • ^ Motobrick Curious
  • Posts: 77
Re: High temp light and fan question
« Reply #4 on: September 10, 2013, 07:20:56 PM »
Thanks all. My fan blades do turn freely. I don't have a temp gauge, though. Just a tach, speedo, and a bunch of lights. That's one reason I'm so skittish about this (non?)issue.
  • Lincoln, TN 37334
  • 1993 K75S? "Stormtrooper" 1999 R1100RTP "Lord Vader"
I am quite sure now that often, very often, in matters concerning religion and politics a man’s reasoning powers are not above the monkey’s.- Mark Twain

It could probably be shown by facts and figures that there is no distinctly native American criminal class except Congress.-
Mark Twain

Offline billday

  • ^ Quintessential Motobricker
  • Posts: 1341
Re: High temp light and fan question
« Reply #5 on: September 10, 2013, 08:02:27 PM »
If you can spin the fan with your finger, don't worry about it. (That's been my approach, and it's worked so far.)

Or, make yourself feel better by draining and refilling the coolant. Then forget about it for five years.
  • New York State, USA 10977
  • 1985 K100

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