Hi Tobias!

Yes you are right I guess coz mine is a 300SEL model and they come with seperate evaporator for front and rear.

I suppose the rear A/C blower is out of gas or system is choked-up thus giving hot air from vent.

This looks like the job for a professional A/C man!!!!!!!!

Thanks for the info and will confirm it with my manual which is kept somewhere in the car.

Best Regards.