AC Compressor Noise - Saab 9000 Bulletin Board - Saabnet.com
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AC Compressor Noise
Posted by Dan Y [Email] (more from Dan Y) on Mon, 25 Oct 2004 21:42:07
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The AC compressor on my '91 9kt makes a muted knocking noise when the engine is accelerated off of an idle. It only makes this sound for a few hundred RPMs as you rev the engine beyond an idle, then the sound quits. It doesn't make noise at an idle nor does the noise occur when the engine is accelerated beyond the problematic RPM range. The noise does not occur when the AC compressor is on with the AC clutch engaged.
It seems as though, with the AC clutch disengaged, that some kind of freewheeling mechanism is worn. Is this noise something that will lead to a seized AC pulley that will break the serpentine belt? BTW, I just noticed the noise today. The compressor is about four years old and was purchased new, not rebuilt. It only has about 50K on it. Anyway, I would appreciate anyone's thoughts on this.
Thanks,
Dan
posted by 66.79.6...
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