overcharged, too much oil, bad compressor valves... etc, without additional information, it's hard to tell what's wrong.

EXACTLY how much refrigerant is in the system?
what are the temps of the lines entering and leaving the compressor?
what temp is the line leaving the condenser?
what temp is the line entering the evaporator?
how clean is the evaporator?
how clean is the blower?
what temp is the discharge air?
what temp is it outside?
what temp is it in the car?

__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!