84 300 CD..just had it fully charged w/3 lbs of R12 (in combination w/new drier/compressor/aux fan/expansion valve). I expected the temp of the chilled air to improve substantially over a partially charged system. I was wrong...it takes a long time (20 minutes on highway) to get the cabin cooled down and that's on full blast. It never gets cold enough to have to turn down the fan. What areas should I investigate? Is there a recirculation feature and if so how is it controlled, etc. I was even thinking of bypassing the heater feed hoses to make sure there wasn't any type of accidental heating going on...

Thanks in advance....