Author Topic: Sensor for radiator fan failure?  (Read 847 times)

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Offline 1965soda

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Sensor for radiator fan failure?
« on: September 11, 2015, 03:57:29 pm »
Hi everyone. 

I have a 1986 900 Ninja (which shares many parts with the C10) and recently started noticing my radiator fan running more than what I believe it should and for much longer than it needs to be. 

The bike does not get ridden much much and I have been commuting on the bike on/off the last week.  The last couple days I have noticed the fan running after shut down (during temps when it previously would not) and also noticed it running for extended periods (30-60 minutes) after shutting down the bike (with temps that did not seem to warrant it to run). 

I have not dug into this yet but am hoping someone may have had similar experience and whether replacing the fan temp sensor took care of the problem. 

Thanks for any thoughts, ideas, speculation, etc.
Currently in garage: 2011 C14, 2007 FZ1, 2001 M900 S4, 1983 900 Seca, 2003 ZRX1200, 1982 650 Seca, 8? Husq 430
Rides of the past: 2002 ZRX1200, 1986 900 Ninja, 1999 Ducati 900ss, 2002 R6, 2005 FJR, 1998 C10, 1998 VTR1000, 1989 1100 Katana, 1983 CB1100F, 1985 900 Ninja, 1983 900 Seca, 1982 Seca turbo, 1982 CX500 turbo, 1982 750 Seca, 1983 550 Vision, 1974 CB400F, mid 70's Rupp :-)

Offline connie_rider

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Re: Sensor for radiator fan failure?
« Reply #1 on: September 11, 2015, 04:06:17 pm »
You didn't say if the engine temp is the same as it used to be?
Power to the fan can only come thru the sensor. Fan motor is ok. The sensor is slower to close than it used to.
But, it might not be a problem with the sensor.
Might be that the engine is running hotter. Possibly from corrosion in the coolant system, or thermostat not opening completely. Flush your coolant system. While under the plastic, look at your fan blades too. May have warped form age/heat.

NOTE: Somewhere on this list, you can find a replacement automotive sensor that costs less than one from Kawasaki and is available at an Automotive Parts store.

Ride safe, Ted
14 Connie (Traveler II) / 03 Connie (Buddy)
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Offline goatmar

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Re: Sensor for radiator fan failure?
« Reply #2 on: September 11, 2015, 04:38:37 pm »
Be happy fan IS running.  :great:  For if it doesn't, then when it needs to it's to late........ high temp (bad thing)  >:(

If fan blades are crapped go to the Muzzy aluminum fan, they work great.
Dave Muzzey  St. Charles, IL  COG#7957  '01 Connie  100K miles and counting

Offline 1965soda

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Re: Sensor for radiator fan failure?
« Reply #3 on: September 11, 2015, 04:40:35 pm »
Thanks for the quick reply Ted and the recommendations. 

Temp on the bike is not noticeably different (using the dash gauge as the basis for my response).  Last evening, I check collant level in the radiator and that was fine.

Although not new, I did a flush of the system and replaced the engine coolant with Engine Ice when my son and I finished the resto on the bike.  We also used the stove-top method to check the function of the thermostat and the fan sure seems to be moving air pretty well.  So although something with those items may have gone amiss....I am feeling more confident about the sensor being the cause.  When I dig into it, I will confirm the items you suggested and if nothing else turns up....replace the sensor.

Thanks as well for the tip on the cross reference to an automotive part!
Currently in garage: 2011 C14, 2007 FZ1, 2001 M900 S4, 1983 900 Seca, 2003 ZRX1200, 1982 650 Seca, 8? Husq 430
Rides of the past: 2002 ZRX1200, 1986 900 Ninja, 1999 Ducati 900ss, 2002 R6, 2005 FJR, 1998 C10, 1998 VTR1000, 1989 1100 Katana, 1983 CB1100F, 1985 900 Ninja, 1983 900 Seca, 1982 Seca turbo, 1982 CX500 turbo, 1982 750 Seca, 1983 550 Vision, 1974 CB400F, mid 70's Rupp :-)

Offline connie_rider

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Re: Sensor for radiator fan failure?
« Reply #4 on: September 11, 2015, 04:58:13 pm »
By the way. I have an old 900 engine (that I used for fitting exhaust pipes when I built my 4 into 1 system).
Do you need anything off of it? I'm going to discard it... (Pretty rough shape, but has side covers etc)

Ride safe, Ted
14 Connie (Traveler II) / 03 Connie (Buddy)
Gone but not forgotten; 87 and 00 Connies..

If your not already a COGger, "consider becoming one".
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Offline rickm_tx

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Re: Sensor for radiator fan failure?
« Reply #5 on: September 12, 2015, 05:51:00 pm »
The sensor that tells you your fan is dead is called the temp gauge.  It will catch a dead fan every time.
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Offline Rev Ryder

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Re: Sensor for radiator fan failure?
« Reply #6 on: September 13, 2015, 05:53:11 am »
Here is the list of interchange part numbers I have for the temperature controlled fan switch for the Concours 1000.  My notes say that the application is the same as a 1991 Honda Civic.  I believe there may be some temp range differences among these various numbers, but they should be minimal.  I hope this is helpful.


ACDelco: E-1858
Auto Tune: PT2628
Beck/Arnley WorldParts: 201-0817
Beck/Arnley WorldParts: 201-1369
Borg Warner: TFS500
Echlin (NAPA): FS-130
Facet: FS8404
Filko: TFS-1
Four Seasons: 35934
G.P. (?): 40-5001
Kem: TW-65
Mitech: TS-84
Motorcraft: no interchange
Niehoff: WA-639B
Standard: TS-84
Wells: SW504
Fortis non Ferox
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