How about a digital CCU?

I’ve been dreaming about gutting a Klima I system and replacing it with an Arduino and toy servos that mimic vacuum pods. Electric monovalve control. Thermistor input. PWM fan control. Micro switch pushbutton controller.

The idea is keep the flaps, evaporator, heater core and blower. That’s it. Everything else to actuate the system will be new.

Design some 3D printed adapters to make vacuum pods using these motors. I think it can be done once and replicated across the car.

OLED temperature and mode display for Def, T/V, Norm and EC + Fan speed.

Two knobs - fan speed and temp.

I think I just hate Klima and I want to start over.

ETA - In other words first replace this:



With this:



I plan on doing this in steps. First adapt the mount and linkage. Then sample the switchover valve voltage (digital input) and pass that on as a pwm output signal to the motor. Once that is designed, replicate it across all flaps using this table as the logic.

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79 300TD “Old Smokey” AKA “The Mistake” (SOLD)
82 240D stick shift 335k miles (SOLD)
82 300SD 300k miles
85 300D Turbodiesel 170k miles
97 C280 147k miles

I hope it works out for you. I had grand Ideas like this but it never materialized. PWM generates rf noise without care and will render your radio unusable.

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1980 N/A 300D with 240d ACC and sanden unit, 281k miles, has a 617.951 turbo motor installed and a 4 speed standard in its future.