I bought a '79 MB 240d at a repo auction about a year ago.
Odometer does not work, reads 198k miles.
Do not know any history of the car.

I have done the following:
    plugged vacuum lines so that motor would shut off
    change oil, several times now, using Synthetic from Walmart
        no leaks
    changed glow plugs to pencil type w new controller
    new tires
    changed rear shocks
    replaced driver arm rest
       
The car is a daily driver, about 60 miles each day.

The a/c compressor is missing.

    what a/c compressor do I need?
    where is it mounted?
    where can I find one?
    what kind of problems will I have in getting the a/c working?

    advice is appreciated.

    and I thank you for past advice.

What else should I look at to improve the car?

j.