A/C hisses and is not cold

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Requiring you ta add Freon and hissing are usually good indicators of a system leak. The short engagement of the compressor indicates the system is still a little low.

One of the best ways to find an AC refrigerant leak is with a UV dye and black light kit. Mist carts stores have the UV dye in a can with an adapter you just push on the low side port and hold for five to ten seconds. You'll then run the system for a day or so and use the black light and special glasses to find the leak.

Places to look are the compressor, all lines, inside fittings on the condenser if you can see it. Listening for the leak may also help. I do not recommend low cost refrigerant detectors, they give false positives too often.

Once found you'll need to replace what's leaking. Send us a picture and we can help.