Intermittant A/C operation.

[CamaroAJ]

you don't have to pull the enging up to get the compressor out. i have replaced a few of these on C/K trucks like yours. also there was a service bulletin way back about the '03 truck compressors being junk. i doubt thats the problem since its so old now.

if you think you have water in the system (which would be hard to do) then might as well pull the orfice tube and replace it. then atleast you can check two things off your list.