Gm Cooling Fan Wiring Diagram

I have had a lot of people ask me about gm radiator cooling fan diagnosis in the past. Suggested electric fan wiring diagrams suggested primary cooling fan single speed on off using 12 volt switching devices only for primary activation note. Here you ll also be exposed to the current path voltage and sensor signal.

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Hayden flex a lite or perma cool brands can provide a 12 volt output when activated.

Gm cooling fan wiring diagram. Most stand alone adjustable thermostats i e. Relays shown in these diagrams can provide options. You will then need switched power usually from your ignition switch wired to the blue wires on the relays. The color coded diagram below will correspond with the wires on the relay kit to help simplify the wiring process.

It uses a 40 amp electric relay and electric fan sensor. Start your wiring project by taking both of the positive wires from the fans and run them to the yellow wires on each relay tab 87. Cooling fans are now controlled by the ecm through the respective module network and using duty cycle control signals. A relay kit our part number ccfkrl will include everything you need to properly wire up.

Wiring a single cooling fan. It basically runs two fans in series for low speed and then put s each on it s own 12v circuit for high speed. Connecting a single cooling fan is a rather straightforward system it relies on a separate temperature sender to switch the fan on or you can utilize the cooling fan output if you ve installed an aftermarket efi conversion. The cooling fan wiring diagram below is what we ve found to be the simplest and most reliable method.

Start with taking both of the positive wires from the fans and run it to the yellow wires on each relay.