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There may be some drag on the AC clutch when it is disengaged as the clutch 'free-wheels' during this time. When you engage the AC ,the clutch 'locks up' and the noise disappears. If the noise gets worse you may need to replace the clutch, if it stays the same and it not very loud, I would not replace it.

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Q: What would be the cause if when the engine makes a light screeching noise when the AC is off but when turned on the noise goes away on my focus?
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