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Re: 2000 deville ac
When you turn the a/c on the clutch engages on the compressor pulley and spins with it,compressor clutches do fail,and the sound your desribing sounds like your problem.You can just have the clutch replaced for about $350 or goto a junkyard and buy one and have someone install it.Unfortuantly luxury cars are pricey regarding to parts.
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That would depend on the problem and prices in your area. You can call around and ask for the cost to replace the ac clutch and the compressor. If the bearing in the clutch is the noise, the clutch can be replaced without replacing the entire compressor assembly.
Have the pressure checked. There is a switch that keeps the compressor off if the pressure is too low. This is the most common cause of no AC. Of course you can also have a bad compressor(this usually makes lots of noise) Or a bad expansion valve. Possibly the switch in the dash but that is pretty rare.
If your husband is correct, the AC pulley is part of the AC clutch, which, typically on many vehicles, is replaced with the AC compressor as one unit. If a person is handy and familiar with cars, the compressor can be replaced at home. The cost of the part would be approximately $200 - 300 depending on the compressor ( re-manufactured, new). The AC system would have to be evacuated and re-charged, as well.
I suggest that the problem should be pinpointed so that the correct part is identified. For instance, there are other pulleys on the engine, one of which my be the cause of the problem.
The car should run okay without the compressor, you just won't have A/C. The cooling fans should still operate with the Engine Coolant Temperature sensor. It is also possible that you just need to charge the A/C system. A loud whining noise is indicative of low charge to the compressor.
I think the noise is most likely from the drive belt, the reason it makes noise with the AC on is that it takes 5 horsepower or more to run the AC compressor, this puts a heck of the load on the belt, as the belt ages it gets hard and polished, this causes slippage, and squeal, esp when a load is on the belt like the AC.
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