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When you turn the ac on it engages the ac clutch which is turned by a fan belt which is turn by the engine. you are making the engine work harder. The idle speed might be set to low or it,s time for a tune up.

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โˆ™ 2004-06-25 10:39:59
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Q: What causes a '93 Civic to idle rough and want to die when the AC is on?
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