do not use your a/c until you have this checked out! could be a belt that needs repacement or adjusting BUT, if it is low on refrigerant, do not just add refrgerant, you need to know why. If it has a leak it needs to be found and repaired. you want a leak free system so as not to loose oil and of course refrigerant. oil is carried with the refrigerant and when there is a leak the oil/refrigerant combo goes out of the leak spot. eventually the compressor gets starved for oil and makes noises, seizes, breaks belts, ect....then you have to dissassemle and flush everything along with a new rec/dryer compressor expansion valve.... ask me how i know! .... LOL..

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1993 Mercedes Benz 300D 2.5 205K (ex wife's)
1984 Mercedes Benz 300SD 320K (SOLD)
2004 Mercedes Benz C240 75K
1995 GMC Sierra 2WD 5.7L 188K
1983 Mercedes Benz 300SD 239K (SOLD)
1987 BMW 325i 220K (SOLD FOR SALVAGE)

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