What Causes Slight Shaking When the Car's Air Conditioning is On?

[StAlexis]

The reasons for slight shaking when the car's air conditioning is on are as follows: 1. Dirty throttle body affecting the engine: Turning on the air conditioning at this time will increase the engine idle speed, causing the steering wheel to shake. Cleaning the throttle body can prevent this issue. 2. Low car power, especially in automatic transmission: When the idle speed is high, it indicates the compressor is working. When not working, the idle speed is low, and the steering wheel won't shake. 3. Ignition system failure: If the car's ignition system malfunctions, it can lead to poor ignition system performance, bad spark plug firing, and unstable idling issues. Here are the items to check when the engine shakes with the air conditioning on: 1. Check the air conditioning's high and low pressure; excessive pressure can cause a sudden increase in engine load. 2. Inspect the engagement of the air conditioning electromagnetic clutch. 3. Check if the air conditioning radiator is clogged with dirt. 4. Verify if there's an excess of refrigerant.