1987 300SDL
Has anyone ever bypassed the CCU by hard wiring 12v (with a switch) directly to terminal connector going to the motor relay > blower motor?

Just want a reliable way to turn on the blower motor to get heat in the car.

Any advice if this is wise or not.

It seems like different parts go bad at different times and all of them are necessary to the proper function of the climate control.

Seems like the CCU is shot again. Why these things go bad so often?

After replacing the CCU ( a few times ) and the motor resister/regulator porcupine thingy, aux water pump motor, and that heater mono-valve, the blower motor not working again after several months. The motor works, its just the ccu is bad again I'm certain. I can return the Programma CCU as it;'s still under warranty. They might send me a new one and it might run for another six months or year before it goes bad again.

But it might just be easier to hard wire a blower motor switch and be done with it.

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1987 300SDL