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COuld be just belt noise, in which case the new belts will fix it.
The AC compressor could be going, that's not unheard of. The bearings have to turn all the time whether its running or not. If you cut or remove the belt to the compressor (you're changing it anyway) you should be able to notice a difference.
BTW all 700s develop low-frequency engine shake at idle when the hydraulic motor mounts are shot. If your oil pan is sitting very close to the sway bay, that could be what's wrong.
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Rob Bareiss, New London CT ::: 86 244DL, 87 244DL, 88 744GLE, 91 244: 808K total
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