Gm Fan Wiring

It basically runs two fans in series for low speed and then put s each on it s own 12v circuit for high speed. Or a single relay could be used to control both fans. What this means in plain english is that as you turn the blower fan speed knob from off to any of the fan speeds lo m1 m2 and hi the blower switch mechanically opens and closes the two contacts necessary to divert the incoming battery power from circuit g to the different.

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Wire going to terminal 30 87 should be 10 12 gauge to handle the current draw of the cooling fan.

Gm fan wiring. Relay coil draws less then 1 amp. These wire connectors are the gm recommended replacement for your gm vehicle s original wire harness connector. Ac blower motor resistor kit with harness replaces 89019088 973 405 15 81086 22807123 fits chevy silverado tahoe suburban avalanche gmc sierra yukon cadillac escalade hvac fan blower motor. 2 wire universal ford and gm engine cooling fan switch connector.

Air conditioning considerations prior to buying a custom wire harness or doing pcm calibration work determine if the vehicle will have air conditioning if electric fan s are required when the a c compressor is on and if the pcm will be used to control the electric fan s. This was a mediocre way of doing things primarily because the current required to spin the fan was drawn through the switch itself. Make sure the ground for the cooling fan is a good one also ensure there is a good ground from the battery side to the frame. The cooling fan wiring diagram below is what we ve found to be the simplest and most reliable method.

Wiring up electric cooling fans michael harding june 2017. Terminals 85 86 can use 16 22 gauge just fine. A couple of decades ago it was popular to simply add a switch under the dash to control an electric cooling fan often referred to as an auxiliary fan. Acdelco gm original equipment multi purpose wire connectors are durable to withstand tough conditions under your hood wheel hub and chassis.

Replaces ford e4fz 88607a e5sz 8b607a gm 88860466 and. 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. In a nutshell the blower switch interrupts and diverts the electrical current from one contact to another.

Use this schematic to wire up. 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.