Climate control unit

The climate control unit consists of the following components:

1. Heater element
2. Damper motor module (DMM), temperature left
3. Blower fan
4. Damper motor module (DMM), fresh air/recirculation
5. Power unit for blower fan motor
6. Particle filter
7. Damper motor module, ventilation and floor (also defroster for MCC)
8. Damper motor module (DMM), temperature right
9. Damper motor module (DMM), defroster (ECC).

Engine coolant constantly flows through the heater element. There is no valve to regulate the flow. The selected temperature is achieved using dampers for the right and left-hand sides of the car installed upstream and downstream of the heater element. These control the amount of air to be warmed. There are also dampers downstream of the heater element that guide the airflow to the correct air vent.

The climate control module provides infinitely variable electronic blower fan control. When AUTO mode (ECC only) is engaged the climate control module (CCM) adapts the blower fan speed to the setting of the controls and the vehicle speed. The blower fan can be set to run-on in order to reduce residual moisture in the evaporator (the function is not available for vehicle's with engine B8444S).

A timer located in the central electronic module (CEM) controls the run-on time. 50 minutes after the engine has been switched off and the ignition has been turned to position 0 or I, the central electronic module (CEM) supplies power to the climate control module (CCM) and the blower fan is activated at full speed for 7 minutes. This run-on dries the evaporator and prevents bad odors.

This function is programmed at the factory, but can be deactivated in the event of customer complaints via programming of customer parameters. Programming is carried out via VIDA.