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most likely it is out of freon
Check the ac compressor and clutch to see where the noise is coming from. Also check the compressor drive belt for wear.
The ac compressorThe ac compressor
Yes, if the compressor's bearings are bad, usually accompanied by a roaring or squealing noise coming from the compressor's pulley.
You first need to find out if your ac compressor is coming on. It should make a click sound then you can see the armature or compressor clutch pulley spinning. If it is not coming on then check ac relay, cycling switch, ac control head, wiring, and any associated fuses. All of these things can stop the compressor from starting
If the fan is working, then probably there is insufficient gas in the ac compressor.
The positive wire on a 1984 Mercedes 380 SL for the AC compressor is the green wire. It provides power to run the compressor when the air conditioner is turned on by the driver.
Check for a blown fuse in fuse block and also at the top of the compressor Bad switch Bad compressor clutch
If the compressor is not coming on at all it could be that you are low of refrigerant and just need to add some more.
The cycle switch not engaging the Compressors clutch
The low side service port for the AC on a 2001 Alero is located on the hose that runs from the accumulator to the compressor. It is the larger of the two hoses coming off the compressor.
You will need to check the condenser for leaks, also check the air compressor, you can check the air compressor by turning on the ac, look and see if the front of the air compressor is turning. If the air compressor is not coming on you will need to replace it.You can also check your 134a level. hope this helps.