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An A/C compressor takes about 6 horsepower to turn it and when an engine is idleing, it is producing about 30 hp so when you take away 6 hp from 30, it puts quite a load on it. There is also a device which increases the idle speed when the A/C is switched on. If this is not working or the idle is set too low then rough idle may occur.

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โˆ™ 2006-07-12 23:58:34
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Q: Why would a 2000 Kia Sephia idle hard when the air conditioner is on but idle fine otherwise?
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