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A primary air conditioning system for a vehicle has an engine driven compressor which supplies refrigerant to a cooling subsystem comprising a condenser, and expansion valve, and an evaporator. A precooling system has an absorption type system which supplies refrigerant to the cooling subsystem whic

A primary air conditioning system for a vehicle has an engine driven compressor which supplies refrigerant to a cooling subsystem comprising a condenser, and expansion valve, and an evaporator. A precooling system has an absorption type system which supplies refrigerant to the cooling subsystem which it shares with the primary system. A combustion unit fueled by the vehicle fuel supplies heat to the generator of the precooling system. The precooling system is used to at least partially cool the vehicle interior before it is occupied, and the primary system is used when the engine is running.

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In an automotive vehicle having an engine, an engine driven air conditioning system and a precooler system comprising: a cooling subsystem comprising a condenser, an expansion valve, and an evaporator; a primary air conditioning system having a compressor for supplying refrigerant to the cooling sub

In an automotive vehicle having an engine, an engine driven air conditioning system and a precooler system comprising: a cooling subsystem comprising a condenser, an expansion valve, and an evaporator; a primary air conditioning system having a compressor for supplying refrigerant to the cooling subsystem; a precooler system having an absorber, a generator, a heat exchanger, and a pump for supplying refrigerant to the cooling subsystem; and valve means for alternatively coupling the cooling subsystem to either the primary system or the precooler system, whereby either system is effective to cool the vehicle.