So far (C200K/W203) Bin So far a C200 compressor with factory built-in auxiliary heating was driven and was enthusiastic about the auxiliary heating – after 30 min the car was heated even at outside temperatures under 0 Grand to T-shirt temperature. Apart from the start time I did not have to adjust anythingNow (C280 /W204) auxiliary heating no longer factory order bar -On recommendation from Mercedes, I had the auxiliary heating of a well-known German manufacturer with its own auxiliary heating – website (name e i don’t consciously have it installed (allegedly the same as the Mercedes has supplied so far). Time set to 6:00 a.m. the following day – in the morning } Engine was warm Car was cold } Called at the car dealership and received the following information When parking the car, turn the heating up to full (28 degrees) and turn the blower automatically on windows and 20 sec. Wait (so that the actuators can set all settings…) } Is it even more cumbersome??? if I forget??? OK – we find ourselves set from time to 6:00 o’clock of the following day + heating on full + blower from Automatically set to windows + 20 sec. wait – on the next morning entered } engine was warm car was almost cold. }> drive to the car dealership and following INFO get lead time to increase to 60min and try again time set to 6:00 o’clock of the following day + heating on full + blower from Automatic set to windows + 20 sec. wait + lead time to 60min – on the next morning } Motor was warm car was almost cold. }> To the car dealership and …….???! !!! I would like to mention here that both the car dealership and the Bosch service involved absolutely took care of the problem – But from the manufacturer with the words “This is state of the art” (poverty certificate) were weighed off. Apparently an employee of the manufacturer said that you are aware of the problem – Then I ask myself why a manufacturer sells for about 2000€ such a garbage – I will no longer buy a product from this manufacturer.