charlie99 wrote:



symptoms are ... fan wont run at boiling point .....(temp sensor) fan relay turns on when input is grounded The fan won't run at around 113deg and it should cut in at 103deg and at that temp the resistance of the fan sensor is 190 ohms

kfreak mentioned that he was getting about 190 ohms in boiling water ....this suggests to me that he was measuring the 2 terminals as one sensor ....which in fact would double the normal reading I was measuring from the fan terminal to earth not across the two terminals.

(given that he also lives at altitude the water would boil at a slighty lower or higher boiling point i figure lower ,,, that might equate to 50 - 75 odd ohms at sea level boiling point ?) I live at an altitude of 900metres so that makes the boiling point 99.67deg

the trick is ...that you measure between 1 leg and the body on each sensor ...most importantly make sure the body of the sensor is actually earth when fitted on the bike thats right

in fact im going to modify mine and tap a thread in the nut housing of about 3 mm and fitt up a additional earth cable that can be removed ...or a good sized brass washer with a tab that will mate up with the threaded section ...and a tab i can solder to or run a bolt through ...........and run it to a known earth point ... (second option sounds the most reliable )

results next week sometime ...i hope

Inge K. wrote:The fan should start at 175 ohm +/- 10% (103^oC).
The warning light should show up at 143 ohm +/- 10% (111^oC).

So at 190 ohm it seems like that you`re not only in the neighbourhood, you
are at the fence......ready to jump.

Inge K.