Rear compartment blower
The rear compartment blowerenables infinitely variableadjustment of the blower outputand of the temperaturein the rear compartment. A coolbox is also operated based on the setting of the temperature control wheel.
The voltage tapped off at the potentiometer is in the range from 1.25 V to 5 V. The voltage tapped off at the rear compartment blower potentiometer is amplified in the IHKA control unit and supplied to the output stage for the rear compartment blower motor. The control voltageis between 0 V ... 8 V.
E38 and E39 only:
The selector wheel for the for the blower output is subdivided into the following ranges. The upper range serves the purpose of setting the air volume. The coolbox is connected with the lower range. In the first 10 degrees of the angle of rotation a microswitch switches the tapped voltage to ground. The IHKA recognizes this status as a switching criterion for cooling the coolbox. The stratification flap for rear compartment ventilation is moved to the ”cold” position.