Climate Control Fix?

[lakeside]

I guess climate control problems are common and I've serched for a solution to mine without luck, so far. My car: '87, 560 sl, with about 184,000 miles, and in fairly good condition. Here's what the climate control is doing or not doing. The automatic control doesn't work. It cools, then stops cooling and may start again after I turn the it off and back on. The auto fan control does not work so I have the fan on full. The heater works but the temp is not controlled. I get lots of very hot air. So, the temperature control wheel does not give sliding control but rather just cold or hot.

What should I look for?