This defect is covered by the warranty.
To correct this defect it is necessary, (depressurization of the heating and air conditioning system is not required) loosen the screws securing the upper part of the heater (1)...

and instrument panel cross member reinforcement mounting bolts (2)...

...move the position of the lower part of the heater so that the drainage holes coincide.
In this case, the "tongue" (3) of the amplifier must necessarily enter the "U" shaped lug (4) on the heater body.

Then tighten all loose fasteners.
