Here is a little history about my car.
I have a 190D 2.5 automatic from 1986, without airco (or any option that matter)
I bought a nice 190E 2.6 with alot of options and airco.
The idea was to put the options to the 190D include the airco.
After the dismembering the 190E 2.6 i found out that not all parts of the airco could be used on the 190D
What parts are different?
electric wires
aircorelays
engine mount aircopump
condenser
condenser aircofan
main airco hose from the pump to the condenser/evaporator
The rest i could use.
Some pictures:
Rebuild airco cable-loom
Rebuild the airco pump
New parts, Airco sensors, new o-rings, rebuild set for the pump with new bearing.
other aircomount for engine.