What Causes Engine Vibration When the Air Conditioner is On?

1 Answers
ElliotLynn
07/29/25 9:47pm
The reasons for engine vibration when the air conditioner is on are: 1. Spark plug carbon buildup—after prolonged use, spark plugs accumulate carbon deposits, causing vibration when the AC is turned on; 2. Throttle body carbon buildup—when the AC is activated, the engine load increases, amplifying the effects of a dirty throttle body, which may stick or fail to open to the correct position, restricting air intake and reducing engine power, leading to vibration; 3. Resonance caused by a deformed fan during operation after the AC is turned on or vibrations due to loose fan mounting screws. Functions of the car air conditioner: 1. Filtering air entering the cabin; 2. Absorbing moisture from the air; 3. Maintaining clean air to prevent bacterial growth; 4. Preventing windshield fogging; 5. Adjusting cabin temperature.
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