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the ac will activate automatically when on defrost for humidity control. it should not cycle unless it is low in freon.
the hissing noise does not make sense unless there is an issue with the compressor. does the hiss stop when the defrost is off??
ok, can you give me a specific area it is coming from???
no, they are just access prots to insert a gauge for monitoring the freon
it may be the IAC on the top. it senses a load and increases a vacuum leak to adjust the idle