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i had a two ton r22 split ac on a basement gas furnace not cooling today.30# suction readind 90 to 100# head. had high super heat and was acting low on chge. tried putting some freon in and no changes. shut high side service valve and wouldnt pump down. closed low and no changes to speak of. compressor sounded bad. didnt act like restriction, indoor fan going and not low super heat anyway. super heat high except a little frost showing at compressor inlet and near suction shu off valve but evaporator and coil was not icing and warm. very strange situation. stuff is older and wants new complete ac system with 410a after seeing this go on and we have hot weather coming. i thought maybe compressor was just not doing anything at all.compressor wasnt building pressures when shutting service valves and freon seemed not to do any thing at all it was just going in and no results. i thought usually suction would be high and head low when compressor junk. it had all the sighns of under cge but wouldnt build up.also one other thing was when i shut it off the system was about 60 # on low and high rather than pin gauges into 120 or more like on normal systems. i am sure system is not low either. two weeks ago i put a little in and noticed superheat and suction was high but had high load inside home and it just didnt seem to be cooling all that well and was 95 degrees outside and was happy to get some relief and then this other situation popped up...a real head scratcher and would like to know what was going on for knowledge even though he wants upgrade on unit!!! thx