relay ? i simply wired mine to the switched 12volt source at the temp sensor for the auxilary fan by where the evaporator is usually.....comes on and off with the car.....i run my aux fan off a switch.....i removed my shot AC system by the way.....much better airflow through the radiator and oil cooler....gets the big compressor out of the way too, easier to get at some stuff now....so i use that 12 volt circuit for my "accessories" ....
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