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				Air conditioner noise
			 
 
			I am getting what sounds like a groan or a moooing sound from somewhere in the front of the car with the AC on.  Can't really tell if its coming from deep in the dash or in the frunk copartment. 
 It only happens after I've been driving for a while and I am coasting to a stop.  It makes the sound for just a few seconds and goes away.  I know its AC related because if I turn off the AC button, the sound goes away instantly.  I put in about 12 ounces of refrigerant in the car about 3 months ago.
 
 Any ideas?
 
				__________________Current car
 
 2000 Boxster 2.7l  red/black
 
 Previous cars
 
 1973 Opel Manta
 1969(?) Fiat 850 Convertible
 1979 Lancia Beta Coupe
 1981 Alfa Romeo GTV 6
 1985 Alfa Romeo Graduate
 1985 Porsche 944
 1989 Porsche 944
 1981 Triumph TR7
 1989 (?) Alfa Romeo Milano
 1993 Saab 9000
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