got a 12yr old lennox split system 2 1/2 ton. A-coil will only get half way cold. A-coil is clean, recovered freon, replaced liquid line dryer, removed, cleaned and check orfice, flushed out with nitrogen, pumped unit down to 300 microns and recharged with r-22. pressures are perfect, about 80 low and 225 high but no matter how much more freon i put in the pressures keep going up but the line set temp wont come down, stuck at about 80 degs. also when charging the unit, the low side needle goes in to retard like normal but when i close my gauges the needle very, very slowly goes back up. its about 85-90 degs here and im out of ideas. it was running about 325 on high side before i replaced the dryer and was causing the compressor to over heat and shut off but still the a-coil will not flood with freon and will only give me a 10 deg temp drop across the coil. any help would be appreciated dont know what else to check for.