Is It Normal for a Car to Shake When the AC Is On?

1 Answers
ORebecca
07/30/25 10:38am
It is not normal for a car to shake when the AC is on. Here are the reasons why the engine may idle roughly with the AC on: 1. Throttle body carbon buildup: For most electronic throttle bodies, the engine will automatically increase the throttle opening to draw in more air and thus increase power output. If the throttle body is not maintained for a long time, carbon buildup can easily form, obstructing the engine's air intake. This can make it difficult for the engine to drive the compressor, resulting in rough idling. Solution: Clean the throttle body. If you drive in harsh conditions, it's best to clean it regularly—recommended every 10,000 kilometers. 2. Excessive air intake: After cleaning the throttle body, if the original opening is maintained, the removal of carbon buildup can lead to excessive air intake, causing engine shaking during startup, poor acceleration, and engine warning light alerts.
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