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Q: ac not blowing but fan is working on 1990 Nissan Axxess

ac stopped blowing but i can hear the fan running. I went to auto parts store and check freeon and it was low. I put more freeon in and still not blowing the air?
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It will be necessary to attach pressure gauges to the air conditioning system to verify the pressures. If you had to top up the system with refrigerant the system has a leak and the system should be evacuated and the leak repaired.
There is a commercially available refrigerant that has dye in it. You add it to the system if there is a leak the dye stains the area of the leak possibly enabling the leak to be found.
If you get a friend to start the engine and turn on and off the air conditioning do you hear the air conditioning compressor cycle on and off?
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