Description
The climate control system is designed to provide a comfortable cabin climate for passengers regardless of outside weather conditions.
The climate control system is available in two versions
- Heating and ventilation system with air conditioning (A/C) and Manual Climate Control (MCC)
- Heating and ventilation system with air conditioning (A/C) and Automatic Climate Control (ACC)
ACC is described in DETAILED DESCRIPTION .
The climate control unit is located in the dashboard with LHD and RHD versions. The difference between the RHD and LHD versions is that the fan housing construction in the RHD version is reversed when compared to the LHD version.
Air enters the climate control system through a cover over the bulkhead partition space. The air passes through a compartment filter located in the bulkhead partition space. Otherwise, air is recirculated from the cabin. The air passes through an evaporator where it is cooled and dehumidified if the A/C system is in use.
Depending on the desired temperature, the air is directed by the air mixing damper past or through the heat exchanger if heat is required.
The temperature in the heat exchanger is not affected by the air mixing damper position but is dependent on coolant temperature and coolant flow.
The air is then directed through the air distribution damper into the cabin according to the desired air distribution selections. Air passes through a number of different vents in various cabin locations.
Cars with MCC (Manual Climate Control) have a climate zone which maintains the same temperature for the entire cabin. Cars with ACC (Automatic Climate Control) allow for two climate zones which maintain separate temperatures for the driver and the front seat passenger. Passengers in the rear seat receive mixed air from the two front temperature zones.
Air is released via openings in the parcel shelf and out into two air evacuation outlets located inside the rear bumper on either side of the car behind the wheel housings.
MCC (Manual Climate Control) is a system for manual climate control. The various functions are controlled with the MCC unit (control panel with integrated control module) which is mounted in the center of the dashboard. Temperature, air distribution and fan speed are adjusted with 3 different knob settings. Electrically heated rear window, air recirculation and A/C are adjusted with buttons. It is possible to activate hazard flashers and separate front seat heaters with the panel.
Scheme 6
The main functions of the ACC system are to control the climate control unit and ensure that the most comfortable conditions are achieved and maintained as soon as possible after starting. Separate temperature settings for the driver and passenger can be selected. The ACC unit consists of a panel with display and buttons as well as a built-in control module. Hazard flashers and separate front seat heaters can be activated with the panel.
Two stepping motors are used to regulate cabin temperature in each temperature zone. The stepping motors are connected to dampers which mix warm and cool air. The heating and ventilation unit contains separate dampers for air distribution to the defrost, floor and panel vents. Each damper is rotated with a stepping motor that is supplied with power by the control module. This design allows air flow to all distribution points simultaneously. When the driver zone requires warmth, defrost+floor is selected; when cooling is required, the panel damper is also opened. When the car is started in cold weather, defrost is selected initially.
The fan is controlled by a control unit. Fan current is lowest when neither zone requires heat or cooling. During starts in cold weather, the value is determined by the coolant temperature and the ambient temperature. Fan current is limited if the engine is not running.
A direct current motor rotates the recirculation flap. Recirculation is selected if a zone requires excessive cooling at high outdoor temperatures or if there is a risk for engine overheating. The control module requests A/C compressor cut-in if the outdoor temperature exceeds 0°C and A/C OFF is not selected.
Scheme 7
Operation mode
The control module is alerted with a bus signal stating that the ignition is in the ON position or that the parking heater has been activated. After the control module has been alerted that the ignition is in the ON position, the following operating mode is assumed
