1. Engine mounts: The engine mounts are responsible for securing the engine to the chassis of your car. If the engine mounts are worn or damaged, they can cause the engine to vibrate excessively, which can lead to shaking. When you turn on the air conditioner, the compressor engages and puts an additional load on the engine, causing it to vibrate even more.
2. Drive belts: The drive belts are responsible for driving the various accessories on your car, such as the air conditioner compressor. If the drive belts are loose or damaged, they can slip and cause the engine to vibrate. This vibration can be felt throughout the car, including the steering wheel and seat.
3. Faulty air conditioner compressor: The air conditioner compressor is responsible for compressing the refrigerant gas and circulating it through the air conditioning system. If the compressor is faulty or damaged, it can cause the engine to vibrate excessively. This is because the compressor puts an additional load on the engine when it engages.
4. Engine cooling issues: If your car's engine is running hot, it can also cause shaking when the air conditioner is turned on. This is because the air conditioner condenser is located near the engine radiator, and when the air conditioner is turned on, it can block airflow to the radiator, causing the engine to overheat.
If you are experiencing shaking when you turn on the air conditioner in your car, it's important to have it checked by a qualified mechanic to determine the exact cause and have the problem repaired.