Why does the car vibrate when idling with the AC on?

[MacGianna]

When idling with the AC on, the car may vibrate due to the following reasons: Carbon buildup in the car: As the vehicle accumulates more mileage, carbon deposits can form in various parts, especially in the throttle body. If the throttle body is excessively dirty, it can obstruct air intake, causing the engine to struggle or barely manage to power the compressor. This results in noticeable car vibrations when the AC is turned on. Engine mount failure: The engine naturally vibrates during operation (including when the compressor is activated), but these vibrations are usually dampened by the engine mounts, making them less noticeable to the driver. However, if the engine mounts are collapsed or damaged, the engine's balance is disrupted. When the compressor is engaged, it may reach a resonant frequency, intensifying the vibrations.