Take the covering off of the blower and remove it. You will need to take the whole black housing out of the inside of the car. This way you can replace the evaporator on the bench...Reassemble the heater box and install again. There are screws and clips that hold the box together .

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Benzmac:
Donnie Drummonds
1981 280GE SWB
1987 16V
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM