Dannym,
If I were you, first I would do a very simple test. Run the A/C for a few min and feel the low side A/C line(large hose/pipe at the drivers side front finder liner) and see if it is cold. If it is colder than the air at the vents then you don't have a problem with the A/C but a problem with airflow. If it is warmer then you do have A/C problems. OK, now the problem possibilities have been cut in half. If the is determined to be airflow related, remove the blower motor under the passenger side dash. Reach up into the hole the blower came out of and toward the driver's side and you can feel the evaporator. It should be cold. All incoming air goes Thur the evaporator. You can't see it but just after the evap there is a temperature door that directs cold air thru the heater core or directs it around the heater core. If the heater core is not hot, then the air is cold. This door and the monovalve is used by the system to regulate the air temperature when in the automatic position.
So if the A/C low pressure line is cold and there is no hot water going into the heater core then any air that does get thru the system will be cold.
Think along these lines and you will be able to define the problem. If you define the problem, you can fix the problem.
I hope in some way this helps.
Paul

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84 500 SEL (307,xxx miles)