Sometimes the bearing holding the a/c pulley becomes out of grease and start sounding. This is an advice that is time to replace the clutch or if available the bearing. To replace it the a/c unit has to be removed. The gas (134A) properly evacuated and all hoses detached. To remove the clutch a puller is needed. Also a snap ring plier remover. Once replaced, attach everything in the reverse order. A vacuum has to be done in the a/c unit and gas and oil added. Enjoy it!
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look at your idler pulley since the ac clutch runs on the serpintine belt its moving alot faster the berings are prob bad in it takes 10 minutes to take off and 17 dollars to replace n another ten but if you take it off spin it in your hand if its rubbing n stopping fast(should spen fast like a skateboard wheel) then its bad that could be all it good luck hope this helps
It could be a belt, if there is more than one belt on your vehicle, make a visual inspection of their condition with engine off, press on the belt side, where the pulleys are more separated to check the deflection, it should not deflect more than 1", get a can of Belt Dressing and spray some on the inner part of the belt(s). If problem continues, make sure the compressor clutch is not seizing up, turn A/C "ON" set it to MAX and check for strange noises on the front of the compressor (the part that turns with the belt is the compressor clutch,) turn A/C OFF and check again, there should be no noise coming from the compressor clutch, If it is too noisy with A/C OFF, have the compressor checked.
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That clutch and coil are serviceable without replacing the compressor but I have had little success with this as usually the clutch gets in that shape subsequently from activity going on inside the compressor which means that clutch is failed generally for a reason.replace the compressor -orfice tube-reciever drier and happy motoring......
the noise is the drain on the belt drive system upon AC start up, the belts may need to be tightened or the AC compressor clutch is in need of replacement, if you are saying when car stops you mean the engine is shutoff then this statement does not apply but if you mean when the vehicle comes to a stop at say a stop light then it applies.
The belt typically won't squeal when too tight, it will just put more wear and tear on the components. I would recommend removing the belt, and cleaning the pulley with brake parts cleaner and a tooth brush. There is probably some sort of residue on the pulley, which is allowing the belt to slip when the a/c clutch engages. If this doesn't help, make sure all of your pulleys are aligned. Use a long straight edge to check their alignment with each other. If they aren't close to perfectly straight, it will cause the belt to ride funny and squeal when the a/c clutch engages.
YOU SEEM TO HAVE A LOOSE OR BAD AC COMPRESSOR DRIVE BELT. WHEN YOU SWITCH THE TO THE VENTS CLOSE TO THE WINDSHIELD IT TURN THE AC COMPRESSOR CLUTCH ON, IT ACTIVATES THE DEFROST. TRY POURING SOME WATER ON THE AC BELT AND SEE IF NOISE GOES AWAY. THE BELT MAY NEED ADJUSTMENT OR MAY NEED TO BE REPLACED. GOOD LUCK