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I don't think that your hissing noise is related to the a/c. It is probably a leak in the vacuum control system. The 700/900 FAQs has some good information on all this; go here http://www.brickboard.com/FAQ/700-900/HeatingAirConditioning.htm and select the links on vacuum control and leaks.
I do notice that on my 960 there is a hissing from under the hood after turning the car off and parking.
Hope this helps.
Mike
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Mike Brown Greenville, NC 1996 965 120K 1994 940 137K 1986 244 137K (odometer broken)
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