FILTER
The particle filter cleans the air of particles such as dust and pollen, which would otherwise pass through the air intake into the passenger compartment.
The multi-filter has the same function as the particle filter, but also neutralizes unpleasant smells and keeps the air as free from gases as possible. In vehicles that have the multi-filter, known as the air quality system (AQS), there is also an outside air sensor that ensures that the recirculation closes in the event that the content of gases in the outside air increases. This increases the service life of the multi-filter.
Scheme 323
The additional heater/parking heater produces heat by burning gasoline. The heat is distributed via the engine cooling system to the heat exchanger and on out into passenger compartment.
When the engine is running, the additional heater can provide extra heat to the passenger compartment in the event that the engine is unable to provide sufficient heat. When the engine is not running, the parking heater can heat the passenger compartment (and the engine). This function can be started directly or using a timer.
- Compressor
- Condenser
- Engine cooling fan (FC)
- Receiver drier
- Expansion valve
- Evaporator
- Blower fan.
Explanation
A - High pressure, warm fluid
B - Low pressure, cold fluid
C - Low pressure, cold gas
D - High pressure, warm gas
Dark arrow - Warm air
Light arrow - Cold air
By allowing the refrigerant to circulate in the closed system and changing the pressure and volume it will change temperature and boil (evaporate). At the pressure found in the system, approximately 170 - 320 kPa (1.7 - 3.2 bar), the refrigerant boils at approximately 0 °C to +4 °C.
A condition of the refrigerant boiling is that the heat is accessible. This heat is taken from the air around the evaporator (6) where boiling occurs. When the heat is taken up by the refrigerant the surrounding air becomes cooler. It is this cooled air that is blown into the passenger compartment by the climate control system blower fan (7). The heat taken up by the refrigerant in the evaporator (6) is transported out to the engine compartment, where it is transferred to the air by the condenser (2). The condenser is cooled by the airflow and the engine cooling fan (FC) (3).