Air conditioning: General
The air conditioning only functions at ambient temperatures above 0 °C. At temperatures lower than this, the pressure in the system is too low and the compressor is never engaged. This setting is made to prevent ice building up on the evaporator.
The air conditioning only functions when the engine is running. The air conditioning functions regardless of engine speed (RPM) and vehicle speed. The compressor is dependent on the engine speed, the higher the engine speed the more cooling that can be provided.
The blower fan must be operating before the climate control system can be engaged.
The air conditioning system has only two positions, off and on. If it is too cold in the passenger compartment, the temperature can be controlled with the normal heat and blower fan controls.
Air conditioning is based on the same principle as that used in refrigerators.
The rear climate control unit in the seven seat XC90 supplies the passengers in the third row of seats with cooled air. For the rear climate control system to function the rear climate control system blower fan motor must be running and the front climate control system must be switched on.