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Joyce, This is not too unusuall. The AC compressor puts quite a load on an engine, especially a smaller engine like a 4 cylinder. I wouldn't worry too much about it. . John In Montana

AnswerWith mine, it's because of the engine mounts. I still have to get one replaced. Before I had one cracked engine mount and one missing. I got the missing one replaced and it's jerking less. It still does, especially when it's hot out and you've been sitting in city traffic. Might that be it? AnswerIt happens on every car fitted with air con.When you switch air con on it immediatly takes a few brake horspower from the engine and uses this power to run the air con compressor, that's why your mpg figures are lower when using air con. This effects small engines more than large engines.
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โˆ™ 2015-07-14 15:06:32
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Q: What would make the engine jerk when the air conditioner is turned on?
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