Fan Bypassed with switch

Bumder · Post by **Bumder** » Wed Dec 08, 2010 8:38 pm

Hi guys,

I know none of you can diagnose my NC30's problem without seeing it.
one of the previous owners has bypassed the cooling fan and fitted a switch to manually turn it on/off. I have read through my Haynes manual and will be testing the fanswitch at the weekend. I will also be testing the temp guage and sender unit as I noticed on the way home (only time it's been out cos the snow) which was a 20 minute ride the temp guage hardly moved.

My question is, is it normallly the fan switch that is faulty which would warrant someone bypassing the circuit as it was an easier job than changing it or is there a more common problem that i could be looking for.

cheers

arsey30 · Post by **arsey30** » Wed Dec 08, 2010 8:51 pm

Does the manual fan switch work [does the fan come on?]
If so, you have no problem, the switch is to reduce the onset of overheating when stuck in traffic.

The temp gauge may well read low in todays temperatures, but it is working, so stat is more likely cause of low reading, if there is a problem at all.
Run the engine at home for a while and see if the needel moves up the scale more

Dave.

Bumder · Post by **Bumder** » Wed Dec 08, 2010 9:33 pm

Hi Dave,

Yeh the fan works from the manual switch.

Not had it running long enough to see temps up at normal, so not sure if fan kicks in or not??? I was just worried that the fan had been wired up like this because of a problem with the fan switch?

Thanks

Post by **Cammo** » Wed Dec 08, 2010 11:54 pm

Bumder wrote: I was just worried that the fan had been wired up like this because of a problem with the fan switch?

Most owners hard wire them so that they can turn on the fan before the bike gets cooking hot in traffic.

I don't think you'll see the temp gauge move much in cool weather.

Post by **CMSMJ1** » Wed Dec 08, 2010 11:55 pm

It will have been wired in as the previous owner was a lazy sod who needed to clean the lower rad out!

If the rads are clean and you are not commuting in 20+C heat then the motor is nice and cool with the airflow running through it.

I have not had a fan for a few years...and only twice has it forced me to stop and cool it......and only one of those times did I have to pour water out of a scenic German town centre fountain on it...

So, clean the rads, don't worry about the fan switch..

Bumder · Post by **Bumder** » Thu Dec 09, 2010 9:20 pm

Thanks for the replies guys.

The bike is mainly for track use, was just a bit concerned it may run hot but i'll just switch the fan on manually if too hot.

Post by **CMSMJ1** » Thu Dec 09, 2010 9:55 pm

If it is for track use then take the fan off as it obstructs the flow through the lower rad at speed.

Saves a few kg's too!

Bumder · Post by **Bumder** » Sat Dec 11, 2010 9:24 pm

Right,

Took the bike out for a run today for the 1st time. When I got back i removed he fairings to have a nose around, the fan switch isn't even connected so is completely bypassed, is this still OK as i'm assuming (not great with wiring etc) that the fan wiill not cut in on its own and will have to switched on manually. Or am I missing something where its been wired up differently and will still cut in??????

Fan Bypassed with switch

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