I did an ac installation many years ago on my 84 280e. I bought the parts used from Aurora in Washington or Oregon (one of those nw states) and paid my indie to install it. I think I paid about 300 for the parts and he charged my 1200 to do the work (I am pretty sure he did not make his rate on it).

The evap unit under the dash needs to be changed as a part of it....the blower is different too. And unlikely as it may seem, the dash controls are different even though they look the same, (IIRC).

Its a lot of work.

The euros often lack the ac.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.