140 PWM fans wiring help
Ive recently fited some VW golf fans up to my 164 as they sized up quite nicely to the radiator and were significantly cheaper than SPAL option. unfortunately i am unsure how to get the PWM function to work. im hoping that maybe its the same prinicple as the modern volvo fans and someone could offer some insight.
i understand that the 4 wires are constant power, ground, 12V fuse (i assume coming from a temp sensor in the vw) and ECU PWM signal.
i bought a cheap pwm controller thats for pc fans thinking it would be the same principle and since the main power wires are not running through it, it should be fine. however i can only get them to operate on full speed which is great for summer but i dont imagine its great for the fans/controller.