Did they evac it and pull a vacuum on it before they charged it? the vacuum gets the moisture out the system and tells you if you have leaks. How much did they put in it?(could be undercharged or overcharged) Is the compressor cycling on and off? If all that checks out could be the reciever drier. Cant really tell without some gauge readings. Could be a restricition in the system somewhere.( If it is that likely FOT) Make sure your condenser is clean free of debris.
tb mod,comp cams 1.6:1 roller rockers,comp cams pushrods, dynomax cat back,ngk tr55 iridiums,k&n kit and accel distributor.