A method for installing a fan in a housing of a heat exchanger assembly, the housing defining a receiving space extending between a first aperture and a second aperture along a longitudinal axis, the housing having a side aperture formed therein and a latching structure disposed in a region of the side aperture, the method comprises the steps of:
- inserting the fan into the receiving space through the side aperture along a transverse direction which is transverse to the longitudinal axis such that an edge region of the fan is positioned in the side aperture and latching to the housing by means of the latching structure.