It's a 1980 300TD and it has a good engine and rust free chassis. The bad: it has one of those servo's that has a bad reputation for always having something go wrong with it! Now, if you had a 1982 parts car with a complete climate control system in it including a monovalve, would you swap out the entire system?

Parts car is a 1982 300D.
My pushbutton Programma climate control unit, the older style is missing from the 1980, but I have a complete system from the 1982 including the Programa. Would this swap make the value go down if I decided to sell it or do you think it would be worth the same or more with the dependable system in it?
Questions, questions.........................................
Decisions, Decisions..........................................