Hey gents, as you may or may not know, I'm currently re-wiring my Tiger, the previous owner basically did a rubbish job and the wiring was a mess of wires constantly changing colours with 5-8 joins on a wire no bigger then 1000mm

Attached picture is on the water collant and seems to be o/c (open circuit) but my fan switch is attached to it. I believe it was the fan switch at a specif temp, and I would presume that at a specific temp the switch would close allowing the fan to switch, but the previous owner has manually wired the fan to a switch in the cockpit.



So this device seems to joined in parellel but not sure of true purpose.

Jason. http://locostbuilders.co.uk/upload/IMG_4615.JPG

The pic looks like a fan switch, used on VW and a bazillion other cars.
He has wired it so he has a manual over-ride that can fire up the fan early etc. Lots of classic car owners do that too, they really worry about temps.

I have a manual over ride on my fan, just in case.

Yeah I've got a over ride button too.

Handy if your sensor/controller fails,as mine did.

Also handy if you are using the car on a track etc,on your cool down lap just switch the fan on to help

These switches are a standard M22 fitting used by Peugeot, Fiat, BMW VW Reanult and Volvo before they changed to giving ECU control of the fan they are very reliable . You can get wide selection of cut in/cut out temperatures and also dual switches that allow 2 speed control of the fan using a resistor.

Ideally you should in wire the switch as using a manual switch as the only method of switching the fan is risky --- use the dash switch as a manual overide if you want not really required because these switches are reliable but some sort of after park-up cool down fan is a good idea -- really essential on turbos.

Thank you for all your answers, it's what I expected it to be. Just don't know what degrees it switches in and out at?

Jason

Usually stamped on one of the nut flats, or actually on the sensor on the bit inside the rad.