Why does the car shake when the AC is turned on?

[AubreeLee]

The most common reason for engine shaking when the AC is turned on is dust accumulation in the throttle body. High compressor pressure: Excessive pressure increases the engine load, which affects the car's stability. During operation, carbon deposits form in the throttle body. Too much carbon buildup can block normal engine air intake, causing insufficient engine power to drive the compressor or barely managing to do so. Engine carbon deposits or aging: If the car experiences idle shaking, the issue usually lies with the engine. If the engine is not cleaned for a long time or shows signs of aging, it can affect normal engine operation. Carbon deposits on spark plugs: After prolonged use, spark plugs accumulate carbon deposits. If not cleaned in time, this can reduce engine torque output, causing the AC to shake.