Air conditioner for vehicles

An air conditioner for a vehicle having a passenger compartment covered by a roof, comprising:

• a condensor unit including a condensor and a first blower means for directing air toward said condensor;
• a cooling unit including an evaporator and a second blower means for blowing air past said evaporator;
• a casing means on the roof and in which said condensor unit and said cooling unit are disposed,
• said casing means having an aperture extending therethrough open between the passenger compartment and the cooling unit for maintaining the cooling unit in communication with the passenger compartment during operation of the air conditioner and through which air from the passenger compartment is drawn by said second blower means when said second blower means is operated, an outside air intake hole open to the exterior of the casing means, and a chamber defined therein open between and communicating with said cooling unit and said outside air intake hole;
• a third blower means in said chamber for drawing outside air into the cooling unit to mix with air drawn through said aperture by said second blower means when said second blower means is operated and for drawing outside air into the passenger compartment through said aperture to ventilate the passenger compartment when said second blower means is not operated.