An attachment unit for a heat exchanger of a motor vehicle, having an integral hinge, which has two attachment parts disposed movable relative to one another, whereby the first attachment part is used for positioning on the heat exchanger and the second attachment part for fixation to a motor vehicle body. The attachment part is produced in a simple manner and is stable against vibrations by the motor vehicle. The integral hinge for support after installation on the heat exchanger has at least one retaining element for the form-fitting insertion in a bearing of the integral hinge.