Method for manufacturing heat exchanger

A method for manufacturing a heat exchanger including first flat tubes, second flat tubes, a first fin group, and a second fin group, wherein the first fin group and the second fin group each include plate-shaped fins and the plate-shaped fins each have slots with open ends at an edge of the plate-shaped fins, the method comprising:

• inserting each of the first flat tubes into corresponding ones of the slots of the plate-shaped fins of the first fin group to form a first assembly;
• inserting each of the second flat tubes into corresponding ones of the slots of the plate-shaped fins of the second fin group to form a second assembly;
• orienting the first assembly and the second assembly such that the first flat tubes face the second assembly and the second flat tubes face the first assembly;
• and
• pressing the first assembly against the second assembly to insert:
• each of the first flat tubes into corresponding ones of the slots of the plate-shaped fins of the second assembly into which the second flat tubes are not inserted, and
• each of the second flat tubes into corresponding ones of the slots of the plate-shaped fins of the first assembly into which the first flat tubes are not inserted.