is coated on the tubes 14 before the assembling process therefore the flux is coated only on the necessary portions and the unnecessary consumption of the flux is avoided application of the present invention is not limited to the condenser described above but it can be applied to other heat exchangers such as automotive radiators though the solder clad aluminum is used for the components requiring brazing in the foregoing embodiment a solder material in a paste state may be coated on aluminum components or silicon si that promotes brazing may be coated on the aluminum components the material of the components is not limited to aluminum but the components may be made of an aluminum alloy though the flux required for brazing the first plates 111 121 and the tubes 14 is coated on the tubes 14 in the foregoing embodiment it is possible to additionally coat the flux on the solder layers 111 b 121 b if necessary alternatively the flux may be coated only on the solder layers 111 b 121 b without coating it on the tubes 14 though the first plates 111 121 having the solder layers clad on the inside surfaces thereof are used in the foregoing embodiment it.