Re: Compressor chirping
I would suspect the A/C clutch bearing. When not in use, the pulley on the compressor still spins, using the clutch bearing. When you engage the clutch, the bearing locks to the compressor, more or less, and doesn't rotate internally any more.
If you want to check the tensioner, remove the belt, and rotate the tensioner pulley by hand, feeling for rough spots or sloppy fit. If it is smooth and non-wobbly, it's more likely the clutch bearing. Depending, you may be able to install a non-A/C belt and just ignore the A/C compressor pulley. Look at your radiator support or underhood for a belt routing diagram. Some will show both routes, with and without A/C, and if you have that, you should just get a non-A/C belt and give that a whirl.
tom
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