OK so i've been reading a lot on this subject.
Found myself a donor system from a race car-to-be so i have spare servos, fans etc..
This is the problem:
when the car is started the fresh air flap is closed.
Turning the fan knob on the CCU gets nothing. No fan motor noise, no blowing, nada.
Upon hitting defrost- also nothing.
All servos are not moving.
As i understand it, when the motor is first started and when it is shut off, the fresh air servo closes the vent completely.
Then, as you regulate the thermostat and the fan motor setting, the servo opens the vents, and routes to
either side mixing servos.
Question is this: does it sound like the fan that is built into the body of the CCU is dead?
And can i replace this fan without buying a new CCU?