Rear Air Conditioning Housing (Models with Rear A/C)

Rear Air Conditioning Housing

Purpose/Design





The rear A/C housing serves for holding the following components
- Blower (1)
- Evaporator (2)
- Heater core (3)
- Air distribution flap (5)
- Air distribution flap actuator motor
and thereby forms one complete unit.
The rear A/C housing provides for distribution of the air required for ventilation of the rear passenger compartment to the air outlets depending on the desired temperature in the rear passenger compartment.

The air distribution depends on various operating states such as:
- Normal operation
- A/C operation
- Heater operation

Function

Rear Air Conditioning Normal Mode:

In normal mode, recirculated air (A) is drawn out of the vehicle interior by the blower (1) when the rear air conditioning is switched off. The recirculated air (A) flows through the uncooled evaporator (2). Then the recirculated air (A) is led through the unheated heater heat exchanger (3) and, depending on the position of the air distribution flap (5), to the air outlets (4 and 6).

Rear Air Conditioning Cooling Mode:

In cooling mode, recirculated air (A) is drawn out of the vehicle interior by the blower (1) when the rear air conditioning is switched on. The recirculated air (A) flows through the cooled evaporator (2) and is cooled down. Then the dried and cooled air (B) is led through the unheated heater heat exchanger (3) and depending on the position of the air distribution flap (5) to the air outlets (4, 6).

If the rear footwell cooling is adjusted via the rear air conditioning air distribution regulator, the footwell flaps for the rear footwell on the front automatic air conditioning box are closed automatically.

The condensation water is led off into the atmosphere via the condensation water drain (7).

Rear Air Conditioning Heating Mode:

In heating mode, recirculated air (A) is drawn out of the vehicle interior by the blower (1) when the rear air conditioning is switched on. The recirculated air (A) flows through the cooled evaporator (2) and is cooled down there. Then the dried and cooled air (B) is heated up through the heated heater heat exchanger (3). The heated air (C) is led to the air outlets (4, 6) depending on the position of the air distribution flap (5). The condensation water is led off into the atmosphere via the condensation water drain (7).