What Causes the Car to Shake When the AC is Turned On?

 

When you turn on the air conditioner (AC) in your car, you expect a cool and comfortable ride. However, you may occasionally experience an unexpected side effect—a noticeable shaking or vibrating sensation in your vehicle. This phenomenon can be concerning, but it's important to understand that it is not uncommon. In this article, we will explore the reasons why your car may shake when the AC is turned on. Additionally, we will discuss how regular maintenance, such as a full car service reading, can help alleviate this issue and keep your vehicle running smoothly.

Understanding the AC System:

To comprehend why your car shakes when the AC is activated, it's essential to have a basic understanding of how the AC system works. The AC system in a car consists of various components, including the compressor, condenser, evaporator, and expansion valve. The compressor, driven by a belt connected to the engine, pressurizes and circulates the refrigerant, allowing it to absorb heat from inside the vehicle. As the refrigerant flows through the system, it undergoes a phase change, resulting in the cooling effect that keeps the cabin comfortable.

Engine Load and Idle Speed:

One of the primary reasons your car may shake when the AC is turned on is the increased engine load caused by the compressor. The AC compressor places an additional strain on the engine, requiring more power to operate effectively. When the AC engages, the engine compensates by increasing the idle speed to handle the extra load. If the engine idles speed is not properly adjusted or if there are underlying issues with the engine or its components, it can result in a rough idle, causing the car to shake.

To address this issue, a car service reading, which includes an inspection of the engine, idle speed adjustment, and proper tuning, can help ensure smooth operation when the AC is turned on.

Faulty Engine mounts:

Another common culprit behind a shaking car when the AC is activated is worn or faulty engine mounts. Engine mounts are designed to secure the engine firmly to the chassis while minimizing vibrations and preventing excessive movement. Over time, these mounts can degrade, lose their integrity, or become damaged, leading to increased engine vibrations.

When the AC system adds a heavier load to the engine, the already weakened engine mounts may struggle to absorb the additional vibrations, resulting in noticeable shaking throughout the car. A full car service can help identify worn or damaged engine mounts and replace them, restoring stability and minimizing vibrations.

Electrical Issues:

Electrical problems within the AC system can also contribute to car shaking when the AC is turned on. The AC system relies on various electrical components, such as relays, switches, and wiring, to function correctly. If any of these components are faulty, it can cause irregular power delivery or disruptions in the AC system's operation.

When electrical issues arise, they can affect the performance of the AC compressor, causing it to operate erratically or inefficiently. As a result, the engine may experience uneven power distribution, leading to shaking or vibration in the car. A comprehensive full car service will include a thorough inspection of the electrical system, ensuring any issues are identified and resolved promptly.

Conclusion:

Experiencing car shaking when the AC is turned on can be a frustrating and uncomfortable problem. However, it is often caused by common issues such as increased engine load, faulty engine mounts, or electrical problems within the AC system. By scheduling a full car service, you can address these issues proactively and maintain a smooth and comfortable ride. Expert technicians can diagnose and resolve the root causes of the shaking, ensuring your car runs optimally, even with the AC running. Don't let a shaking car dampen your driving experience—keep your vehicle in top condition with regular maintenance and professional servicing.