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Hi,When you turn the AC on, the compressor is engaging I take it?
Does the low side line (the larger diameter aluminum pipe) get cold? If it does, there is likely a blend door issue of some sort preventing the cool air from exiting the registers; if it does not, then we will have some sort of charge/pressure issue. Primarily this is going to be incorrect charge level issues... either due to being under charged, over charged, or "topped off" by adding more refrigerant into a system that already has air in it. As a secondary concern there could be an actual compressor internal issue or blockage in the system, that is pretty rare though.
If the line does not get cold, are you able to get low side and high side pressure readings?