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Rapid cycling noise S70 1998

posted by  someone claiming to be TB on  Fri Dec 14 05:01 CST 2001 [RELATED]

There is something under the hood that is cycling on and off every five seconds or so. It's not very loud as I can only hear at idle. I'm guessing the air pump. It doesn't feel heavy enough to be the AC compressor. Any ideas? I have never heard it before, so I'm guessing something has gone wrong (bad relay?).





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