Air Conditioner Puzzler... Any Ideas?

[CTScott]

There is a pressure transducer next to the sight glass on the aluminum tubing. A few have had that go bad resulting in a similar condition. The best first step would be to have the pressure checked to see if you are actually low on refrigerant or not. Some of the DIY refill kits have a gauge that gives you a general idea, but that just measures the low pressure side. A proper testing will measure both to verify that the compressor is functioning. You can actually pickup a DIY manifold gauge set for about $60, if you want to test it yourself.