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I disagree.Ac clutch will cycle on and off and result in that neighborhood of fluctuation.
Agreed. My post was intended to convey 600-800 rpm is normal fluctuation as ac or charcoal cycle on and off. However, every 5 seconds is atypical.I disagree.
If it is the A/C causing it and it really is happening every 5 seconds, that's way too often and indicative of an overcharged system.