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You can use a funnel and a section of heater hose to listen around the area, just be careful and not get the hose caught in the belt. Or you can take the belt off and turn the pulleys by hand to check for bearing noise.
air compressor clutch bearing is failing - repair if too costly a rebuilt unit installed by yourself plus Pro - one in a can recharge of freon will be needed. If above not do able - remove main serpetine drive belt + measure and by trial and error acquire Shorter Belt to Fit everything without going around Air Conditioner pulley . Noise will be gone but no Air Cond. and this is cheapest route but getting right shorter belt Length is Time consuming .
Hello, There are several things which can do this. First, cut off the A/C and then rev the engine as before. If the chirping goes away, the noise was either the A/C clutch or the Serpetine belt slipping with the load. For the A/C clutch, you can try a little rust removal between the drive plate and the pulley with the engine OFF. You can use sandpaper and try to knock off the rust. Then put a little oil on to condition the metal. Then try it with the A/C on.
If the chirp is still there, you have to check bearings on the Pulley tensioner, Alternator, Water pump, and Power steering. It is possible for the Pulley tensioner to have a weak spring or you may have a stretched Serpetine belt. This condition would cause the belt to skip under a load. If the belt is checked with small cracks, just replace the belt. Take off the tensioner and compare the spring tension and wobble in the pulley to a new unit at the Autoparts store.
If still no success, the chirp could be a water pump bearing. The old way off using a piece of wood on the housing of a part while the engine is running is dangerous, but effective. I believe you should have already found your problem before this measure is needed. Dry Serpetine belts make quite a lot of noise and is probably your problem.
Belt removal instructions (and routing information) may be found on a sticker under the hood. I have posted a picture of the diagram below if these instructions have faded. The routing on the left is without the AC.
In the worst case the shaft will be frozen and when the compressor clutch engages, your serpetine belt will smoke and fall off. Before that, if you have the proper Freon pressure and the compressor clutch engages, it will make a noise like loose marbles scrapping inside a cylinder.
There is suppose to be oil in the compressor, a certain weight like motoroil differs, get the right one. There are cans of Freon which have an oil charge in them. You add it to the low pressure side of the system just like regular Freon. Sometimes you can get lucky and add it and the noise will go away and there is no damage. Other times the parts are pitted and the oil will lube them up and its too late.
If your A/C is not putting out and not making noise, then it is something else like a simple recharge or fixing a leak.
Either the belt tensioner is going bad or the compressor or clutch is going bad. Is the belt tight? Check the deflection in the belt if it is to loose replace the tensioner. Also double check the belt part number and make sure they sold you the correct length belt.