l4hlsn

I have a 2002 g 400 cdi that has given me the creeps in the past, but for for the most part of last year it was flawless. a few days ago the a/c was slow to start a few days later the ac rest lite came on on the climate control unit and the system just quit. I changed the exxpansion valve , recharged the system with new 134a refrigerant, checked all the wires and valves and still the light won't go off and no a/c. what did I miss, is there something else at the compressor I missed?