Double heat exchanger having condenser and radiator

A heat exchanger through which air passes, the heat exchanger comprising:

• a first core portion having a plurality of first tubes through which a first fluid flows and performing a heat exchange between the first fluid and the air;
• a second core portion arranged in line with the first core portion in an air-flow direction in which the air flows, the second core portion having a plurality of second tubes through which a second fluid flows and performing a heat exchange between the second fluid and the air;
• a first tank disposed at a flow-path end of the first tubes to extend in a direction perpendicular to a longitudinal direction of the first tubes and to communicate with the first tubes;
• a second tank disposed at a flow-path end of the second tubes to extend in a direction perpendicular to a longitudinal direction of the second tubes and to communicate with the second tubes;
• a first tank cap for closing an open end of the first tank in the direction perpendicular to the longitudinal direction of the first tubes;
• a second tank cap for closing an open end of the second tank in the direction perpendicular to the longitudinal direction of the second tubes, wherein:
• the first tank cap has a protrusion protruding from the first tank cap toward the second tank and contacting the second tank cap to form a gap between the first tank and the second tank.