What causes the shaking when the air conditioning is turned on in a Mercedes-Benz C-Class?

[SanNaomi]

Mercedes-Benz C-Class shaking when the air conditioning is turned on can be attributed to the following reasons: Excessive compressor pressure: If the idle speed shakes immediately after turning on the air conditioning, it is likely due to high and low pressure issues. Therefore, it is essential to check the air conditioning's high and low pressure to see if the pressure is too high. Excessive pressure increases the engine load, thereby affecting the car's stability. Throttle needs cleaning: If the idle speed shakes when starting the car and turning on the air conditioning, it is necessary to check whether the throttle is clean. If it is dirty, clean it promptly. Engine carbon buildup or aging: When the car experiences idle speed shaking, the issue generally lies with the engine. If the engine is not cleaned for a long time or shows signs of aging, it will affect the engine's normal operation. Air conditioning issues: Check whether the air conditioning radiator is unobstructed, as this can also cause idle speed shaking when the air conditioning is turned on.