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Brief description

Brief description

The climate system in the Saab 9-5 is designed to give the driver and passengers a pleasant interior climate whatever the exterior conditions.

The climate system is available in three designs:


• Heating and ventilation system with manual control (MCC, Manual Climate Control).

• Heating and ventilation system with air conditioning (A/C, Air Conditioning) and manual control (MCC) (aftermarket).

• Heating and ventilation system with A/C and automatic control (ACC, Automatic Climate Control).


The MCC and ACC controls are described in group 8, ”MCC” and ”ACC”.

The climate unit is located in the cabin behind the dashboard. The unit is available in versions for LHD and RHD, where the layout of the RHD version is the reverse of the LHD version.

Air enters the climate system either through the bulkhead partition space cover or as recirculated air from the cabin. The ventilation fan, located in the climate housing under the bulkhead partition space cover, draws in air and passes it through the fresh-air filter and, if fitted, the carbon filter.

On cars with A/C, the air then passes through the evaporator. If the A/C system is operating, the air is cooled down.

The air then passes the air-mixing flaps. The car is divided into two climate zones where the driver can experience one temperature and other passengers experience another temperature. The air-mixing dampers direct a certain amount of the incoming air through the heat exchanger.

The temperature in the heat exchanger is not affected by the position of the air-mixing flap, it is independent of both coolant temperature and coolant flow. If the cold air position has been selected, the air-mixing flaps are closed to prevent the air from reaching the heat exchanger. On cars with A/C, there is a shut-off valve for the coolant flow to the heat exchanger. This function which opens to the solenoid valve is activated when max cooling is to be provided by the climate system. Certain engine types are equipped with a circulation pump in order to improve the coolant flow through the heat exchanger to increase heating capacity.

The air is then directed into the cabin via the air distribution flap according to the selected air distribution setting. Air ducts direct the air to various outlets distributed throughout the cabin.

Finally, the air exits through two air evacuation outlets located inside the rear bumper on the right and left sides.

P bus and I bus

For further information about P bus and I bus, see System overview