hi, i need to find a place for my fan switch as i have no hole on my rad. please see photo below to ID which plug is for the fan switch

[Edited on 22/9/09 by RMarine]
Rescued attachment whats this plug.JPG

Hi - the simple answer is they're both temperature sensors not switches. One was for the dash gauge and the other for the ECU I believe on the car. Later vehicles only had the top sensor. You won't be able to drive a relay or the fan directly from them. You'd need a fan switch in the rad or one that plumbs into a hose.

you could make a simple electroonic circuit - a comparator to switch a fan - you would need to design in some hysteresis though.

easier non electronic option is to drill the radiator in front of a hose and use a screw in boss into which the switch fits.

I have one of these on my escort rad - dunno where it is from but it works.

if rad is brass, you can solder it in place, not so easy if aluminininininum.

[Edited on 23/9/09 by 02GF74]

Fan should really work on radiator core temperature not engine.

Top one is ecu temp sender and bottom one is gauge temp sensor.