Same as for evaporator.



Remove front seats. I've done it both ways, it's much more accessible with seats out.

Remove console.

Remove dash.

Remove HVAC box.


Installation is reverse of the above.



Helps to have the factory manual.
Search for documentation where someone else has done it.
Make lots of notes how stuff disassembles, and store fasteners in baggies for each component.
You also need to partially disassemble in front of the windshield to access the heater core pipe stubs.

All in all, wasn't too bad, just tedious.

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14 E250 BlueTEC black. 45k miles
95 E320 Cabriolet Emerald green 66k miles
94 E320 Cabriolet Emerald green 152k miles
85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles