My air conditioner still blows but, the air is warm. It needs refrigerant. I need to know if refrigerant can be added or if it will have to receive some kind of modification to add refrigerant. Car surges and lunges from time to time. Has not affected the performance of the car. It can be drivern anywhere. Have had the transmission checked time and time again. The check engine light comes on with a transmission code.

Yes, It has to be done by weight. Now you need to take it to a vehicle AC place, have the refrigerant sucked out of it onto a recovery machine that also creates a vacuum and the correct amount of gas added by weight. They use subtractive scales to weigh the gas cylinder. It also has to be the right type of gas.

Philip, You may have to have a good tech, check,diagnose and estimate repair. Could be a few things causing poor AC, recheck your charge level,check your fan at the condenser, make sure the condenser isn't obstructed, compressor clutch could be faulty, system could be plugged with contaminates limiting refrigerant flow.You say the system has been recharged, was it done properly, if not system could be plugged. AC system should of had system checked for leaks,evacuated, flushed, new orifice tube, then recharged with proper quantities of oil and refrigerant. Check the attached links,instruction and guides, Good luck
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Check fuses, and low and high pressure switches which often fail.

Does the compressor run ? If yes, you would need to know what the high and low pressure readings are to proceed.
It could be a blend door problem under the dash, or something else.

The very first thing you need to do is to check for fuses or say faulty fuse. Secondly check fan which starts along with air conditioner, it might be manually switched off or the fan may have been clogged. Also reason can be lack of refrigerant - charge your air conditioner with refrigerant. Last thing you need to check is cooling coil - the cooling coil may freeze if there is no refrigerant in the system.

purge system might b over charged &check &make sure compressor is running

Air vents may be blocked or your system needs to be recharged with refrigerant.

you could have a leak in the ac system which would be why you had to add freon. take it to a repair shop and ask them to check fo rleaks because adding more freon wont fix your issue if there is a leak.

Sounds like you AC did. gve out that is. The A?C appears to need a boost of refrigerant.

To get the refrigerant in you have to have a technician purge the system first. Hope that helps.