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The engine has to power the air conditioner pump, so less revs are made resulting in less revs for the alternator, resulting in less volts so your gauge drops a little

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12y ago
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Q: Why does your battery gauge go down when you cut your air conditioner on?
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Related questions

Why is your air conditioner only coming out of the defrost in the car?

It have battery


Would a bad alternator cause your air conditioner to blow warm air?

A bad alternator will cause a battery to go bad. It does not have an effect on the air conditioner.


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The air conditioning uses up the battery power.


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Yes, but it will not work.


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