Ac, 94 E320

I own a 94 E320. No matter how cold the outside temp is, at a setting of 75F on the internal temp. dial, the AC used to blow. Lately it used to cycle on and off every 5-10 sec -- intermittently. Now it wont work any more. Smythe European, in San Jose CA wont see it for another 3 weeks. I am thinking of taking it to AAA repair facility.

Does anyone have any idea what was happening? I should say that I did notice some low freon and tried charging it. Did not do much, if anything, killed the AC sooner!!

Is there a thermostat I need to change? The car seems to have many.

How do I get a hold of a service manual for the car?

Thanks