ok guys here is one of my last big items to have my Tahoe fully refreshed with 0 issues. so yes im fixing the stupid a/c on request of my wife i dont care about it myself. ill be buying all the parts from rockauto also. when i bought my truck the pipes to the compressor were disconnected so obviously needed work. im going to be buying a new compressor, dryer accumulator tank, and condenser and the pipes on the top of the compressor and from the condenser. probably the switches and sensors too. ive already replaced the HVAC controls inside. so i see ac delco, uac, gpd, four seasons, Delphi, denso options any brand opinions out there. i also know little about the a/c system besides after i replace the parts it will need to be professionally purged and refilled. lastly what is the orifice tube should i be concerned with it or should i get the updated one that has some automatic adjustment features.