When the air conditioning is on, the air comes out at room temperature. When new refrigerant is added, it works again but only for a few weeks.
Based upon your description, it appears you have a refrigerant leak. If you have inserted refrigerant that has 'UV Dye' included, detecting the leak is helpful with a 'UV light'. There are four major components linked together with hoses and brackets. Any leak may be evident with an oily 'UV' residue. A qualified technician, such as one from YourMechanic can assist in finding and repairing any leaks.
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