i just finished doing the converison. I could do a write up i suppose if enough people asked for it.

basically its pretty simple:
1) go to the boneyard and get everything for system off the car( wiring harning harness, heater and evap box, cables, water valve, control, wood trims,) Remove it yourself and becareful to not break any of the plastic because as plastic gets old its more brittle especially in the cold. The worker at the junkyard i broke some plastic parts which i had to super glue back together.
2) remove everything assoicated with ACCII( wiring harness, heater core tubes, hoses, pushbutton unit, drain coolant, remove dash)
3) put the heater and evap box in first, water valve, hoses, hook up cables(the 2 cables on the water valve go to the opposite in the cablin, so left goes to right and right goes to left.
4) pull up the heating and ac wiring diagram for the car pillaged
5)Wire it in adding wire if necessary. use 10 gauge wire for the blower motor and 16-22 for rest of the wires.
6)do a test run on the system make sure it works.
7) put the dash on and enjoy the system

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1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)