a/c not working
First thing, if you don't feel comfortable opening the service panel on your condenser outside, call a pro. Find the contactor, similar to the pic here. The pic is a single pole contactor, yours might be a dual or look a little different but when the thermostat calls for cooling the furnace/air handler inside sends 24V AC to the coil on the contactor and pulls down the contactor causing the condenser fan and compressor to start(spot marked with an "X" in the pic) When this coil gets stuck in the closed position the outdoor unit never shuts off and causes the condenser to freeze up. This can burn up your compressor. When you replace the contactor, pull the disconnect/fuse outside and make sure that the thermostat is set to off so that you don't have 24V AC coming to the contactor coil. Let me know how it turns out.