My A/C hasn't worked since I bought my Tahoe about 2 years ago. The system has a leak in the discharge and suction line at the high/low quick connectors. The threads the quick connectors screw onto are so worn that no good seal can be made between the line and the connectors. I bought a new discharge/suction line, new compressor since mine made a funny noise anyway, accumulator and orifice tube. I want to replace these parts myself to save on labor costs, then just take it down and have it evacuated and charged, but don't know what seals and/or o-rings I will need to replace in addition to the parts. Anyone know off hand what seals/o-rings I'll need, and is the dealer the best source to get them, or is there a better/cheaper place to get them?