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Re: ac hissing noise
My 96 with rear air does the same thing. I want to say especially on very hot days. I don't worry about it as long as I get cold air.
BTW - Air bubbles in the sight glass on top of the drier are an indication of low freon. Temps less that 30 degrees cooler than outside air are another indication you might need servicing. Should be 30-40 degrees below outside air when checked at the center vent, on high, with the circulation button pushed, and upper vents selected.
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