2 Speed Cooling Fan Wiring Diagram

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Joined feb 6, 2004. #2 · may 11, 2020. Volvo has an excellent 2 speed relay. I used mine to operate 2 fans instead of 2 speeds.

I'm sure someone may chime in or you can google the volvo relay and find out how others. The electric fan assembly is built using a high output two speed motor. If you choose to operate the fan using both speeds, two switching devices or a derale dual fan controller part # 16788 / 16789 must be used. Relay 2's resting position is connected to the low speed fan. So, when relay 1 is pulled down, relay 2 immediately passes battery voltage to the low speed fan. When the hi temp switch is triggered, it switches relay 2 and the high speed fan is energized. It's a lot less complex and a lot less wiring. Not to mention eliminating two giant diodes. Wiring diagram cooper mini fan r56 resistor speed cooling solution low need northamericanmotoring fuse.