AO Gold Member
Join Date: Apr 2002
The switch built into the radiator is the control for the fan (perhaps 92° C fan on, 88° C fan off). It basically provides a -12v to the fan relay.
You should be able to use this with any new fans that you install. Use the relay to control the fans and use the switch in the radiator to control the relay.
You can also install a switch inside the car which will switch on the fan any time you want a bit of extra cooling.
Just connect the negative output from the switch to one of the contacts on the radiator switch. Its easy to check which one - connect a wire directly to the negative terminal of the battery and the other end to each terminal in turn on the radiator switch - which ever one switches on the fan is the right one !!!
You are basically providing the -12v to the radiator switch and fooling the relay into switching on the fan.
156 2.5 V6 24v, Cosmos Blue Metallic, Tan Leather, 17” GTA's, 225/45 Michelin PS2's, Full Zender body kit, GTA Headlights, Eibach springs, Koni FSD's, Eibach Anti-roll bars, Ferrari 360 Brembo calipers, DS2500 pads, Squadra ECU, 45mm Intake Runners, Carbon Intake, Dan & Wizard exhaust
156 2.5 V6 Qsystem, Red + Red Leather, Bilstein dampers, DS2500 pads...soon Brembo calipers, 17" GTV Teles