Or a single relay could be used to control both fans. This is the relay, (40amp) and this is how my wires are run. This is the diagram for what we're doing here. Depending on the model, the thermostat (sending unit) triggers the fan on at 185°F. Fan turn-on at 200°, off at 185°. If so do you know if they come in different temperature turn-on specifications? Grounds terminating at the inner fender. and off at 175°F. and off at 165°F. proper coolant percentages.. that its not blowing bubbles while its running indicating the head gasket is blown or the head cracked.. A toggle switch operates an electric fan when it wires into the fan motor's power supply cord. 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. For those of you that know how to read a circuit diagram, this should be all you need to know. High speed cooling fan relay: BLK/WHT, # 31S-PA17, terminal # 17 @ PCM For example, dual thermostat switches or dual relays could be used to control each fan separately. Pre-wired connector plugs into fan connector and the red wire is routed to the relay via an inline crimp connector. 3652). Thanks for the thumb down :-) Hypertech makes a fan switch (Part No. 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. Make sure you get the right green wire and go make it happen. The electric fan should start immediately. 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. Also check the fan switch on the radiator and the fuse. The radiator switch is a simple on/off unit controlled by coolant temperature. Available through Summit Racing (800) 230-3030 for about $45. Just splice into this wire and run thru a switch to ground. If you were to add a manual switch to ground out those control wires, you should be able to manually switch on the fans. Available at Pep Boys for about $25. the battery. HAYDEN 3653 OPTIONAL DIODE PN: … It's as if the toggle switch isn't there. 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. There is a blue wire connected to the oil thermosensor at the rear of the motor. The parts in black are the stock wiring for the cooling fan. A toggle switch can be wired into the system to manually override the cycling of the fan. It uses a 40-Amp Electric Relay and Electric Fan … Features: Thermal switch mounted in radiator. If fan started, reattach the Green Wire to the proper (+) wire on the A/C clutch or Manual Switch. I suppose if you want to N rig it, hook up a toggle switch between the fan and the battery. Fan turn-on at 185° and off at 170°. 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. 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. or on at 195°F. Features: Replaces factory switch. Also very convenient to simply flip a switch to verify that the fan is working. 4028). The parts in red are what you're adding to make this work. 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. 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. Wiring Diagram. 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