Depending on the model, the thermostat (sending unit) triggers the fan on at 185°F. Looking at the diagram: The relays are controlled by switched grounds at the PCM, behind the right side of dash near base of A-pillar. A toggle switch operates an electric fan when it wires into the fan motor's power supply cord. Or a single relay could be used to control both fans. Fan turn-on at 185° and off at 170°. 3652). Wiring Diagram. Also very convenient to simply flip a switch to verify that the fan is working. For example, dual thermostat switches or dual relays could be used to control each fan separately. This is the diagram for what we're doing here. Available at Pep Boys for about $25. Edit, Yes you can, just wire the fan, ground the ground wire,and run the positive to the fuse box to an accessory fuse that only comes on when the key is on. I suppose if you want to N rig it, hook up a toggle switch between the fan and the battery. SWITCH IN RADIATOR COOLANT OR OPTIONAL ADJUSTABLE FAN SWITCH WITH RADIATOR PROBE (GROUND SWITCHING, NON-VARIABLE SPEED ONLY) 5 AMP FUSE POWER SOURCE SHOULD BE BATTERY OR JUNCTION BLOCK NEAR BATTERY FAN Optional override switch turns on fan, by-passing temp sensor and A/C relay. The parts in red are what you're adding to make this work. If so do you know if they come in different temperature turn-on specifications? 4028). The system powered by a red/black wire from the ignition switch, through the fuse to the switch on the radiator, then an orange/black from the radiator switch to the fan and a brown from the fan to chassis earth. All the fan wiring is completely separate from any other wiring on the car. The parts in black are the stock wiring for the cooling fan. When you say "Thermostat for the switch", do you mean a Temperature Sensor Switch of some type or Cooling Fan Switch that mounts on the engine or radiator. It's as if the toggle switch isn't there. There is a blue wire connected to the oil thermosensor at the rear of the motor. and off at 175°F. Features: Replaces factory switch. or on at 195°F. Pre-wired connector plugs into fan connector and the red wire is routed to the relay via an inline crimp connector. For those of you that know how to read a circuit diagram, this should be all you need to know. Make sure you get the right green wire and go make it happen. Features: Thermal switch mounted in radiator. Grounds terminating at the inner fender. HAYDEN 3653 OPTIONAL DIODE PN: … This is the relay, (40amp) and this is how my wires are run. and off at 165°F. the fan switch on the main is only controlling the fan relay.. your fan relay could also be bad.. warning.. please check your cooling system for proper coolant levels. Hayden makes a fan turn-on relay (part no. Also check the fan switch on the radiator and the fuse. If fan started, reattach the Green Wire to the proper (+) wire on the A/C clutch or Manual Switch. Hypertech makes a fan switch (Part No. A toggle switch can be wired into the system to manually override the cycling of the fan. The cooling fan wiring diagram below is what we’ve found to be the simplest and most reliable method. The electric fan should start immediately. It uses a 40-Amp Electric Relay and Electric Fan … Available through Summit Racing (800) 230-3030 for about $45. The radiator switch is a simple on/off unit controlled by coolant temperature. High speed cooling fan relay: BLK/WHT, # 31S-PA17, terminal # 17 @ PCM If you were to add a manual switch to ground out those control wires, you should be able to manually switch on the fans. Thanks for the thumb down :-) What I'm trying to do is run the fan completely on a toggle switch, not hooked up to anything other than that and the relay. Just splice into this wire and run thru a switch to ground. 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