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The screeching noise is of course the belt traveling faster than the pulley it is around, in other words it's slipping. Hopefully you have a worn belt, it takes quite a bit to pull a compressor. Assuming that the compressor is in working properly and your belt is good, look at the tension pulley. I had a vehicle once that did the same thing and after a lot of "try this" didn't work I got a new tension idler pulley and it fixed it. The old one wasn't putting enough tension on the belt to hold it tight enough to pull everything. Since then I have ran into several that were so weak they wouldn't hold proper tension. Just something that is overlooked a lot of times because he belt seemed tight enough. Just one more thing to try, hope it's not anything with the compressor because as you know they like those compressors and want give them up cheap. Gillight
Hello Bernie, If the compresser is locked up, but the electric clutch will still spin free, then simply disconnect power to it, just thought i would mention that in case that was problem.
The way the belt is routed, it is hard to get the proper tension on the belt by using a shorter belt. It's a trial an error ordeal of trying many different lengths of belts until you find the right one, if at all.
There is also a bypass pulley that you can purchase that will mount in place of the seized AC compressor on the 3.0 litre engine---It will bolt in to place with the orginal bolts and you can retain the use of the orginal belt. No cutting, drilling or other modifications required.
The easiest way to do that would be to remove the compressor and install a "compressor by-pass pulley". These are manufactured by a couple different companies to help people that cannot afford to fix their A/C but need to get their vehicle back on the road. This fix allows you to use the original belt for your vehicle without having to re-rout anything. AutoZone carries one made specifically for your vehicle. It is part #34175. List Price: $34.99
Start by isolating the issue. Remove the belt and start the engine. If it is still there, it is likely resonating through the engine from the flywheel/flexplate. If it dies, spin the alternator. This was a problem in some of there cars. Let me know what you find.
If oyu know how to loosen the drive belt on your car do that and if your car will turn or start then your a/c compressor is locked up. depending on the car you might be able to get a bypass belt if cant afford to fix it know let me know
If your clutch was frozen the belt would be making a loud squalling noise, the belt would burn up shortly. Start your engine, turn on air conditioning, then open the hood, and do an eyeball inspection of the belt, see if it is moving around the pulleys. If it is you only have a worn belt.