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Poor air flow could be caused by a dirty filter, plugged evaporator coil, loose fan blade, motor turning too slow, curtains or other obstacles directing the cold air directly back into the A/C.
If the unit were short of refrigerant, the evaporator coil would only *partially* frost.
The Appliance Information Site
[This message has been edited by DanO (edited November 14, 2002).]