Wow! $250 with working AC?! Lucky!

Try a search of the site (I recommend the google search feature), there is lots of info on here about adjusting the valves. There are special bent wrenches that make the process easier, but they are not required; 2 14mm open end wrenches will work.

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine