Gm Cooling Fan Wiring Diagram

Here you ll also be exposed to the current path voltage and sensor signal.

Gm cooling fan wiring diagram. 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. 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. You will then need switched power usually from your ignition switch wired to the blue wires on the relays. Cooling fans are now controlled by the ecm through the respective module network and using duty cycle control signals.

The cooling fan wiring diagram below is what we ve found to be the simplest and most reliable method. It basically runs two fans in series for low speed and then put s each on it s own 12v circuit for high speed. Start with taking both of the positive wires from the fans and run it to the yellow wires on each relay. A relay kit our part number ccfkrl will include everything you need to properly wire up.

Relays shown in these diagrams can provide options. Hayden flex a lite or perma cool brands can provide a 12 volt output when activated. I have had a lot of people ask me about gm radiator cooling fan diagnosis in the past. It uses a 40 amp electric relay and electric fan sensor.

Most stand alone adjustable thermostats i e.