Heater unit for automotive vehicles, permitting easy removal and fitting of heater core from and into casing

摘要

A casing accommodating the heater core comprises a main body formed by first and second casing elements joined together at their peripheral edges, and a third casing element detachably joined to the main body and formed with hot air outlets. Part of the peripheral edges of the first and second casing elements cooperate to define an opening at which the third casing element is joined to the main body. The opening is exposed to the outside when the third casing element is detached from the main body, and through which the heater core can be removed from and fitted into the casing with ease.