I was digging through the paperwork found in the glove box of the 300SEL. Tucked in with all the original manuals was this piece of paper:
It appears to be a list of issues with the car, perhaps written for a mechanic to review. With some luck, these repairs will have already been performed. Nothing is of a really any major concern except for the heater fan not working. This is a major job to repair, and its often one of the first things I check when inspecting these cars for the first time. Other complains point to issues with the warm up thermostat on the injection pump, perhaps. The tires are shot no matter what, the exhaust is home to mice, and the AC is the least of my concerns.