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Re: a/c compressor making noise
If the van is out of warranty, take it to a non-dealer for an estimate. Ask your neighbors or co-workers for recommendations on a local repair shop. Dealer hourly repair cost is typically much higher than other repair shops....compressors are not cheap and replacment is labor intensive, but you could save some money taking it somewhere else.
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Is the whining noise coming from the engine compartment where the compressor is located or is the noise coming from inside the car? If the noise if coming from inside the car it could be your blower. When a blower wears down the bushing is the first thing to wear down and it begins to have play. That makes the blower/fan vibrate making a loud whining noise. Replacing the blower could solve that whining noise.
If the noise if coming from the AC compressor, it also could be a bad bearing within the compressor.
Could just be a worn belt or faulty or loose tensioner. Does it only make noise when AC compressor kicks in? If it's not a metallic sound, and sound more like a screech/squeel, then I'd look close at belt condition, and tension.
Get a second opinion. The ball bearings do go out in these compressors prematurely, but will only make the sound when it's on or engaged. You may have another pulley making the noise, or the tensioner, or possibly idler pulley. Could be many things, but doesn't sound like it is the compressor making the noise. Could be a failing water pump too...... Take the serpentine belt off, and turn the engine on. Do you still hear the noise? This little test will eliminate a few possible problems for you.
The noise you are hearing is the clutch bearings going out on a/c compressor. The problem with removing the belt is that you will have to find a shorter belt for van and be able to reroute the belt in a way to make everything work. It's not likely to work the way each pulley has to rotate, some clockwise and counter clockwise. All the pulleys rotate in a different direction. If you continue to run the van like this what will happen is the clutch will either lock-up or come apart causing the belt to either come off or burn up. Hope this will help you.
Are you sure the noise is coming from the compressor and not the belt tensioner or other accessories, when you turn the ac on it put more of a load on the engine. If not since the compressor was changed twice was it properly oiled and the clutch turned manually to insure proper lubrication. I am hoping if it is the compressor that the reciever dryer and expansion valve was changed and the ac system was flushed well, to insure no contamination, or blockage damaging the new compressor.
Ask the dealer this is 3rd time its going to replace it there must some factory defect which is causing this problem , please get the compressor with extended warranty say about 3 years, tell your facing this problem ,once fixed get it checked every 3 months which helps keep a long life of the compressor and reduce the burden to you for maintainance of the car................