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Thank you for the tip. Maybe with a higher frequency can solve the problem. For now I let is as is and I will think when or switch or motor fail... Thank you again! Christian

Maybe.. but for now I leave it as is because switch and motor are working, and I don't like change a running system... :-)

Definitly! In low speed the motor buzz so loud that I decide to put the old switch in again.

Just an update: I tried to change the switch with a step-less PWM electronic module. Forget it, the motor is much louder than with the original switch with the 2 resistances. So after 3 hours of work I was at the same point that at the beginning... :-( Christian

For now I want only control the speed of the fan. In my eyes the pos. 1 is too fast and makes lot of noise. But your idea is great! Maybe I change also the valve on the coolant line! My idea was also to add 2 small fan's for the 2 lines to the feet. to heat more the bottom part of the cab...

Thank you! For all other: here are the current in Amps: U=24V 1: 4A 2: 5A 3: 6A When you change position or on start needs aprox. 8A. Christian

Dear all! Does someone know the power consuption of the cab ventilation fan? It's the classical fan without AC, I want to try to get it working with a PWM control instead of the on 1-2-3 switch... Thanks! Christian