Features: Replaces factory switch. Wiring Diagram. The parts in red are what you're adding to make this work. Just splice into this wire and run thru a switch to ground. The parts in black are the stock wiring for the cooling fan. Depending on the model, the thermostat (sending unit) triggers the fan on at 185°F. Fan turn-on at 185° and off at 170°. Available at Pep Boys for about $25. There is a blue wire connected to the oil thermosensor at the rear of the motor. and off at 175°F. This is the relay, (40amp) and this is how my wires are run. The radiator switch is a simple on/off unit controlled by coolant temperature. Features: Thermal switch mounted in radiator. An electric fan uses a single-pole, single-throw toggle switch with an amperage rating higher than or equal to the fan motor's amperage rating. A toggle switch can be wired into the system to manually override the cycling of the fan. or on at 195°F. For those of you that know how to read a circuit diagram, this should be all you need to know. This is the diagram for what we're doing here. and off at 165°F. Hypertech makes a fan switch (Part No. 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. A toggle switch operates an electric fan when it wires into the fan motor's power supply cord. the battery. 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. proper coolant percentages.. that its not blowing bubbles while its running indicating the head gasket is blown or the head cracked.. 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. It's as if the toggle switch isn't there. Pre-wired connector plugs into fan connector and the red wire is routed to the relay via an inline crimp connector. Available through Summit Racing (800) 230-3030 for about $45. If you were to add a manual switch to ground out those control wires, you should be able to manually switch on the fans. 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. Also check the fan switch on the radiator and the fuse. I suppose if you want to N rig it, hook up a toggle switch between the fan and the battery. Fan turn-on at 200°, off at 185°. Grounds terminating at the inner fender. It uses a 40-Amp Electric Relay and Electric Fan … Make sure you get the right green wire and go make it happen. For example, dual thermostat switches or dual relays could be used to control each fan separately. 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. 4028). 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. HAYDEN 3653 OPTIONAL DIODE PN: … The cooling fan wiring diagram below is what we’ve found to be the simplest and most reliable method. Thanks for the thumb down :-) If fan started, reattach the Green Wire to the proper (+) wire on the A/C clutch or Manual Switch. 3652). Also very convenient to simply flip a switch to verify that the fan is working. If so do you know if they come in different temperature turn-on specifications? Hayden makes a fan turn-on relay (part no. Or a single relay could be used to control both fans. The electric fan should start immediately. All the fan wiring is completely separate from any other wiring on the car. 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