$2900 is too much for the 220D. Even with the A/C working it isn't worth $2000. The A/C on that engine is actually a drawback. The old style York compressors draw so much power from the engine they are just about impossible to keep up with in-town traffic and forget about climbing hills. If they've changed to a Sanden or other rotary style compressors it's much better.

For $2900 you can get an '80's or '90's diesel Benz which will be of a higher build quality. Before anyone gets defensive regarding the characteristics let me say, I own a 1972 250C, a 1973 280, a 1974 280C and a 1985 500SEL and although I prefer my '70's W114 bodies there is no comparison to the '85 W126 as far as build quality.

I owned a 1973 220D for 10 years and loved the car. It still would give me trouble starting in the wintertime even here in Tucson. I had a block heater for those mornings when I knew it would be cold. The only time it ever left me stranded was on a cold winter day, 20 F with the wind blowing about 20 miles an hour straight through the radiator.