Parking Heater

Parking Heater:

The parking heater applies B+ on pin 3 of the MCC unit when the coolant temperature by the parking heater outlet reaches 40 °C. When the ignition is off, the following selections result:
^ the air-mixing flap is set to 100% heat
^ the air distribution flap is set to defrost and after 25 minutes to defrost/floor
^ the recirculation flap is set to the position selected with the button
^ the fan speed is set to match knob position 1, irrespective of the actual setting of the knob
^ manual selections can be made with the temperature and air distribution knobs the fan speed can be set to 0 or 1 and air recirculation to on or off

Parking Heater:

The parking heater applies B+ on ACC unit pin 3 when the coolant temperature by the parking heater outlet reaches 40 °C. When the ignition is off, the following results:
^ Air-mixing flaps controlled automatically according to the set temperature.
^ Air distribution flap in defrost position for 25 min and then in defrost/floor position.
^ Recirculation flap in the recirculation position when the temperature is below -10 °C, otherwise fresh air
^ fan current 6 A
^ display shows only fan speed
^ Manual selections can be made with all the buttons except OFF, ECON and rear window heating. If AUTO is pressed, the full display is shown.

The control module returns to normal as soon as B+ on pin 3 is interrupted or the ignition is turned to ON.

Adjustment
The ACC unit can be adjusted with the diagnostics tool to:
^ put the air-mixing flap continuously in full heating position and the air distribution flap continuously in defrost position.
^ select another fan current
^ select how long the air distribution flap stays in defrost position before defrost/floor is selected