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1Back to top Go down   Thermo fan not working Empty Thermo fan not working Wed Mar 03, 2021 1:48 pm

K one zero zero

K one zero zero
New member
New member
Hello all

My thermo fan isn’t working and I believe it’s the sensor, I’ve ordered one and should have in a few weeks.

In the meantime, does anybody know what the oms reading cold and hot it should be for my existing sensor? Want to double check it by dropping it in boiling water to test existing one.

I have also rewired the bike with a motogadget 
M unit, and the relays are good.

Any help would be much appreciated.

Thanks

    

2Back to top Go down   Thermo fan not working Empty Re: Thermo fan not working Wed Mar 03, 2021 3:20 pm

Laitch

Laitch
Life time member
Life time member
Click on the Portal tab at the top of this page, then click on the Tech Page link. Read the oath; affirm it by heartily clicking the I agree box and you’ll arrive at the Tech Page index. Near the bottom of the column of entries under Electrical click on the Troubleshooting the EFI (English) link unless, of course, you only type in English but not read it; otherwise, read the French version or use Google translate.

Scroll down through that document and you’ll reach a graph of resistance values to use in the boiling water test of a temperature sensor function.


__________________________________________________
1995 K75 81,000 miles
Thermo fan not working Usa-lo10
    

3Back to top Go down   Thermo fan not working Empty Re: Thermo fan not working Wed Mar 03, 2021 4:34 pm

robmack

robmack
Life time member
Life time member
Go to the other kbike forum. http://www.motobrick.com/index.php?topic=11299.0
In that post, I included a link to an excel sheet with data and a graph of the response curve for the sensor.

http://k75retro.blogspot.ca/
    

4Back to top Go down   Thermo fan not working Empty Re: Thermo fan not working Sat Mar 06, 2021 9:43 am

cycleman

cycleman
Silver member
Silver member
If you bypass the sensor you can hook 12 volts directly to the fan and see if it turns. Does the fan turn freely when you turn it by hand. With the engine off, side panels off you can get your hand in and turn the fan.

On my 86 K100 I found that the insulation had burnt off the wires going to the plug on the fan. Surprise the fan still worked, but it was fairly stiff so I ended up taking the fan out and lubing it and repairing the wiring. Works fine now. So there are other issues that can affect the fans operation.

    

5Back to top Go down   Thermo fan not working Empty Re: Thermo fan not working Sat Mar 06, 2021 4:39 pm

K one zero zero

K one zero zero
New member
New member
Thanks for the info!! Yes fan works! Looks like it is the sensor, will know for sure once it arrives.

    

6Back to top Go down   Thermo fan not working Empty Re: Thermo fan not working Sat Mar 06, 2021 4:42 pm

robmack

robmack
Life time member
Life time member
To isolate the failure to either the temperature module or the sensor, ground pin "E" on the temperature module. If the fan comes on and the overheat indicator on the dash also comes on, then it's likely the sensor. If not, then it's likely the temperature module.


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

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