Rad fan on when cold. - SV650.org

06-01-11, 06:48 PM

Just wondering if theres something up (I think there is) or whether its a common quirk.

Since its been really cold the rad fan is on when you turn on the ignition and stays on until the engine warms up slightly (couple of minutes riding), then goes off and doesnt come on again until the engine is really hot (as it should).

If its an issue I'll just replace the fan switch.

andrewsmith · 06-01-11, 07:41 PM

Sounds like a short.

I'd swap the switch and see what happens

Sid Squid · 06-01-11, 09:27 PM

Pull the connector off of the switch, the inch wide brass hexagon on the back of the radiator, does this stop the fan running? If yes, then the switch is duff.
If no then the wiring around the switch area should be checked first.

06-01-11, 11:13 PM

Ok so it shouldnt do it. I'll have a look at the weekend.

Thanks

09-01-11, 05:42 PM

Solved today. After finding in the summer that the rad fan wasn't even plugged in, I found out that some numpty (presumably the same one who left the fan unplugged...) had plugged the fan temp sensor into the carb heaters and the air temp sensor into the fan. So the fan was on when cold and the carb heaters didnt work.

Hence the fan being on when its cold and it running rough too.

All sorted now...

06-01-11, 06:48 PM	#1
flak monkey Guest Posts: n/a	Rad fan on when cold. Just wondering if theres something up (I think there is) or whether its a common quirk. Since its been really cold the rad fan is on when you turn on the ignition and stays on until the engine warms up slightly (couple of minutes riding), then goes off and doesnt come on again until the engine is really hot (as it should). If its an issue I'll just replace the fan switch.

06-01-11, 07:41 PM	#2
andrewsmith Member Mega Poster Join Date: Apr 2010 Location: Newcastle upon Tyne, Just south of salad dodging country Posts: 7,750	Re: Rad fan on when cold... Sounds like a short. I'd swap the switch and see what happens __________________ RIP Reeder 20/07/1988 - 21/03/2012. Always missed squire!!! Every year we meet old friends, gain some new ones, lose old ones and you always remember them all. “Live as if you were to die tomorrow. Learn as if you were to live forever.” Mahatma Gandhi

06-01-11, 09:27 PM	#3
Sid Squid No, I don't lend tools. Mega Poster Join Date: Jul 2003 Location: Skunk Works, Nth London Posts: 8,680	Re: Rad fan on when cold... Pull the connector off of the switch, the inch wide brass hexagon on the back of the radiator, does this stop the fan running? If yes, then the switch is duff. If no then the wiring around the switch area should be checked first. __________________ If an SV650 has a flat tyre in the forest and no-one is there to blow it up, how long will it be 'til someone posts that the reg/rec is duff and the world will end unless a CBR unit is fitted? A little bit of knowledge = a dangerous thing. "a deathless anthem of nuclear-strength romantic angst"

06-01-11, 11:13 PM	#4
flak monkey Guest Posts: n/a	Re: Rad fan on when cold. Ok so it shouldnt do it. I'll have a look at the weekend. Thanks

09-01-11, 05:42 PM	#5
flak monkey Guest Posts: n/a	Re: Rad fan on when cold. Solved today. After finding in the summer that the rad fan wasn't even plugged in, I found out that some numpty (presumably the same one who left the fan unplugged...) had plugged the fan temp sensor into the carb heaters and the air temp sensor into the fan. So the fan was on when cold and the carb heaters didnt work. Hence the fan being on when its cold and it running rough too. All sorted now...

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