An air conditioning apparatus includes a valve for selectively introducing
the coolant discharged from a compressor to either a flow path for a
water-coolant heat exchanger or another flow path to avoid the heat
exchanger, a thermostat for detecting the temperature of a cooling water
flowing into an engine and a controller for controlling the valve. When
the temperature of the cooling water is equal to or less than a
predetermined temperature, the controller controls the valve so that the
coolant discharged from the compressor is introduced to the water-coolant
heat exchanger. When the temperature of the cooling water is more than
the predetermined temperature, the controller controls the valve so that
the coolant discharged from the compressor avoids the water-coolant heat
exchanger.