AC not working/hissing sound from rear

Since the weather is getting warmer I have been trying to use my AC and it's not blowing cold air. The refrigerant level is okay since I checked it since I do refrigeration for a living but there's hissing sound coming from the rear when the heat is on as well. It sounds like a snake goes on them off. Any ideas


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Snyone?


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Hose leak somewhere

 

its my AC line passenger side by ac compressor..how hard to change