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Energy conservation may be increased and emission production reduced in a cooling system for the internal combustion engine (10) of a vehicle that includes a high temperature radiator (50) and a lower temperature radiator (38) aligned so that airflow will flow serially through the two, passing throu

Energy conservation may be increased and emission production reduced in a cooling system for the internal combustion engine (10) of a vehicle that includes a high temperature radiator (50) and a lower temperature radiator (38) aligned so that airflow will flow serially through the two, passing through the lower temperature radiator (38) before passing through the higher temperature radiator (50). A liquid cooled condenser (30) is in circuit with the lower temperature radiator (38) and provides condensed refrigerant to an evaporator (20). A compressor (34) is in circuit with the condenser (30) and the evaporator (20) to provide for air conditioning and a charge air cooler (42) for the vehicle engine (10) is located in series with the lower temperature radiator (38) and the refrigerant condenser (30) to provide for improved cooling of charge air. The vehicle engine 10 is in series with the high temperature radiator 50 as is a heater 14.

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A liquid cooled condenser for use in a refrigeration system, comprising: an elongated, round or partly round tube; a pair of headers, one at each end of said round or partly round tube; each header having a plurality of elongated slots and sealing the associated end of the round or partly round tube

A liquid cooled condenser for use in a refrigeration system, comprising: an elongated, round or partly round tube; a pair of headers, one at each end of said round or partly round tube; each header having a plurality of elongated slots and sealing the associated end of the round or partly round tube: the slots in one header being aligned with the slots in the other header; elongated flattened tubes in said round or partly round tube and extending between said headers; the ends of each flattened tube being sealingly received in corresponding slots in said headers; caps sealing said headers oppositely of said elongated tubes; a pair of refrigerant ports for said caps, at least one port in one of said caps; a pair of spaced coolant ports in said round or partly round tube, one of said coolant ports being defined by a plurality of coolant port slots; coolant tubes in said coolant port slots; a refrigeration system connected to said refrigerant ports; and a liquid coolant circulating system connected to said coolant ports.