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Air Conditioning and Coolant
Ford Focus
Heating Ventilating and Air Conditioning

What would make the engine jerk when the air conditioner is turned on?


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2015-07-14 15:06:32
2015-07-14 15:06:32

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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The AC compressor puts quite a load on the engine, especially one with less cylinders. It puts a load on the engine, causing it to jerk back and forth.

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You could have ignition problems if it is the engine causing the jerk.

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What do you mean by jerk?.......... Surge? hesitate? transmission slip? Misfire? I need a better explanation.

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Either to be a jerk, or they wanted it for there car. It probably has no value, maby they had no engine in there subaru, maby!!!!

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A damaged timing belt would stop the engine from running probably with no warning. If you should have an "interference engine" it would basically destroy the engine.


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