Heater motor not working? On a W115 I'd walk as it's a very time consuming and expensive fix. Dunno about this W124.

Coolant leak at thermostat? Leaky gasket? Loose bolts? Cracked gooseneck (if it has one)?

At least he's not posting that it's run for a million miles and gets 40mpg.

That being said: no radio and no speedo means that it probably wasn't well cared for. My logic is that if an owner keeps even the simple things in good condition they would, by default, be conscientious enough to stay on top of maintenance and the other major systems as well.

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1974 240D "Boldie" 170K.- New timing chain/freshly rebuilt IP/replaced valve seals/injectors/upgraded stereo/new Bilsteins with Yokohamas/fresh paint and rocker panels plus lots of welds.