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If it's a 4 cylinder engine, that's pretty normal. AC compressors take a little extra torque to operate and small engines just need to work a little harder when the AC comes on. There SHOULD be a little bit of an idle speed increase to compensate for the AC, but sometimes the computer, relay or whatever mechanism was used by the vehicle manufacturer, is adjusted wrong. If it's just a minor annoyance, ignore it. It certainly doesn't cause any real problem. If it's really bothering you, you might need to take it to a shop.

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โˆ™ 2006-08-25 14:38:23
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Q: Why does my car shake when you put the air conditioner on?
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