More efficient HVAC fan for cars?

[redpoint5]

Higher resistance (low fans speed) does consume a higher percentage of the total power, but it also reduces the total power. For example, on high fan speed, the most power is consumed, but 0% of it is wasted by resistors.

[aardvarcus]

I replaced a three resistor four fan speed controller with a PWM controller in my 1994 Suburban. I now have a dial, and can dial the speed to any speed I want, which is a nice feature.

[Ecky]

Originally Posted by aardvarcus

I replaced a three resistor four fan speed controller with a PWM controller in my 1994 Suburban. I now have a dial, and can dial the speed to any speed I want, which is a nice feature.

Have a writeup?

[aardvarcus]

Ecky,

I never did a specific writeup for it, it was in the middle of my "rewire the vehicle from scratch" bout of insanity. Not that hard to do though, 12v Fan Power in, 3 wire potentiometer, output to the fan motor.