preferably a foot air mode door 46 is provided for selecting a foot air mode with continuing reference to fig1 a heater unit 50 having a heater core is provided for heating cold air passing by an evaporator unit 52 typically the heater core is supplied with heated cooling water from the engine 11 during the heating cycle of the air conditioning system the heater unit 50 acts as a heat exchanger using the heater cooling water to heat the cold air passing through the evaporator 52 an air regulator door 54 is provided for regulating the amount of air heated by the heater unit 50 evaporator 52 is in fluid communication with a compressor 60 compressor 60 is preferably a variable displacement compressor or a fixed displacement compressor or a mechanically controlled compressor that draws in refrigerant compresses the refrigerant and discharges the refrigerant evaporator 52 is also in communication with an expansion valve 62 expansion valve 62 expands the liquid refrigerant fed from a receiver 64 receiver 64 performs vapor liquid separation of the refrigerant fed from a condenser 66 condenser 66 condenses and liquefies the refrigerant fed from compressor 60 through heat exchange with outdoor air condenser 66 is cooled by a cooling fan 68 which is driven by a driver motor 70 compressor 60 further includes an electromagnetic clutch 72 that is in communication with a compressor drive pulley 76 for engaging and disengaging a drive belt 78 driven by engine 11 however in alternative embodiments of the present invention compressor 60 does not include an electromagnetic clutch and thus is in continuous engagement with engine 11 an air conditioning system control unit 82 acu is.