Car Shakes When AC Is On: Causes and How to Fix It

Car Shakes When AC Is On: Causes and How to Fix It

A smooth and comfortable ride is highly desired by every car owner. However, when your once smooth-running car starts to shake and vibrate when the AC is turned on, it can be quite concerning. Not only does it make for an uncomfortable ride, but it can also be a sign of underlying issues with your vehicle.

In this article, we will explore the common causes of why a car shakes when the AC is on and the steps you can take to fix it. By understanding the root of the problem, you can address it timely and ensure your car is running at its best.

What Causes Car Shakes When AC Is On?

What Causes Car Shakes When AC Is On?

As a mechanical engineer, I have encountered many car issues in my line of work. One common issue that car owners often complain about is the shaking or vibration they feel when the air conditioning (AC) is turned on.

This problem can be quite alarming, especially for those who are not familiar with how cars work. In this article, I will explain the main causes of car shakes when the AC is on.

1. Worn Out Engine Mounts

The engine mounts are responsible for holding the engine in place and keeping it from moving excessively. However, over time, these mounts can become worn out or damaged, causing the engine to move and vibrate more than usual. When the AC is turned on, it places an added load on the engine, which exacerbates the problem and leads to the car shaking.

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2. Faulty Spark Plugs or Ignition Wires

Spark plugs and ignition wires are crucial components in the engine that ignite the fuel-air mixture to power the car. However, if these parts are worn out or faulty, it can cause the engine to misfire, leading to a rough idle and vibrations when the AC is on. The AC compressor requires extra power from the engine, and if the spark plugs or wires are not functioning properly, it can result in a shaking sensation.

3. Low Engine Oil

Proper lubrication is essential for the smooth operation of the engine. When the oil level is low, it can cause friction and heat build-up in the engine. This can lead to a rough idle and vibrations, especially when the AC is on, as the engine needs to work harder to power the AC compressor.

4. Dirty or Clogged Air Filters

Air filters are responsible for filtering the air entering the engine to mix with the fuel. Over time, these filters can become dirty or clogged, restricting the air flow and causing the engine to work harder. When the AC is turned on, it places an extra load on the engine, and if the air filters are not clean, it can result in shaking or vibrations.

5. Malfunctioning AC Compressor

The AC compressor is the heart of the car’s air conditioning system. It compresses and circulates the refrigerant to cool the air inside the car. If the compressor is not functioning properly, it can cause the car to shake when the AC is on. This could be due to low refrigerant levels, a faulty compressor clutch, or a malfunctioning compressor itself.

How to Fix Car Shakes When AC Is On

How to Fix Car Shakes When AC Is On

If you have ever experienced a shaking or vibrating sensation in your car while the air conditioning (AC) is on, you know how uncomfortable and concerning it can be. Not only is it disturbing for passengers, but it can also indicate potential issues with the car’s engine or AC system. As a mechanical engineer, I have encountered and solved this problem many times. Here are some steps to follow to fix car shakes when the AC is on.

Step 1: Check the Engine Mounts

The first step in addressing the car shakes is to check the engine mounts. These are the parts that hold the engine in place and prevent it from vibrating excessively. Over time, they can wear out and break, causing the engine to shake when the AC is on. Inspect the engine mounts for any cracks or signs of damage and replace them if necessary.

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Step 2: Inspect the AC Compressor

The AC compressor is responsible for compressing refrigerant gas and circulating it through the AC system. If the compressor is not functioning correctly, it can cause the car to shake when the AC is on. Inspect the compressor for any leaks or damage and repair or replace it as needed.

Step 3: Check the AC System’s Belt

The AC system is connected to the engine through a serpentine belt. If this belt is worn out or damaged, it can cause the AC system to work harder, leading to vibrations in the car. Inspect the belt for any signs of wear and tear and replace it if necessary.

Step 4: Clean or Replace the AC Condenser

The AC condenser is responsible for cooling and condensing the refrigerant gas from the AC system. If the condenser is dirty or covered with debris, it can cause the AC system to overheat, leading to vibrations in the car. Clean or replace the condenser as needed to ensure proper functioning of the AC system.

Step 5: Check the Spark Plugs

Faulty or dirty spark plugs can cause the engine to misfire, leading to vibrations in the car when the AC is on. Inspect the spark plugs and replace them if they are worn out or dirty.

Step 6: Recharge the AC System

If the AC system is low on refrigerant or has a leak, it may cause vibrations in the car when the AC is on. Recharge the AC system and make sure there are no leaks to ensure smooth operation.

Step 7: Get a Professional Diagnostic

If the above steps do not fix the issue, it is best to take your car to a professional mechanic for a diagnostic. They have specialized tools and equipment to identify and fix any underlying issues causing the car to shake when the AC is on.

Conclusion

In conclusion, experiencing a car shake when the AC is turned on can be frustrating and concerning for any car owner. However, this issue can be caused by a few common reasons such as a damaged engine mount, dirty air filter, or low refrigerant levels. By understanding the potential causes and following the recommended solutions, you can fix the car shake and ensure a smooth and comfortable driving experience.

Regular maintenance and servicing of your car’s AC system can also help prevent this issue from occurring. Don’t hesitate to consult a professional mechanic if the problem persists, as they will be able to diagnose and fix the issue effectively. With proper care and attention, you can keep your car running smoothly and enjoy a cool and comfortable ride every time.

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Frequently Asked Questions

Why does my car shake when I turn on the AC?

Your car might shake when the AC is on due to several reasons, including worn out engine mounts, faulty spark plugs or ignition wires, low engine oil, dirty or clogged air filters, or a malfunctioning AC compressor.

How can worn out engine mounts cause my car to shake?

Engine mounts hold the engine in place and prevent excessive movement. Over time, if they become worn out or damaged, the engine can move and vibrate more than usual, especially when the AC adds extra load to the engine.

What role do spark plugs and ignition wires play in this issue?

Spark plugs and ignition wires ignite the fuel-air mixture in the engine. If they are worn out or faulty, the engine can misfire, leading to a rough idle and vibrations, particularly when the AC is on and requires extra power.

Can low engine oil lead to car shaking with the AC on?

Yes, low engine oil can cause friction and heat build-up in the engine, leading to rough idle and vibrations, especially when the AC is on and the engine works harder.

How do dirty or clogged air filters contribute to this problem?

Dirty or clogged air filters restrict airflow into the engine, causing it to work harder. When the AC is on, the extra load on the engine can result in shaking or vibrations.

Is a malfunctioning AC compressor a possible cause?

Yes, if the AC compressor is not functioning properly due to low refrigerant levels, a faulty compressor clutch, or a malfunction in the compressor itself, it can cause the car to shake when the AC is on.

What are the steps to fix a car that shakes when the AC is on?

The steps include checking the engine mounts, inspecting the AC compressor, checking the AC system’s belt, cleaning or replacing the AC condenser, checking the spark plugs, recharging the AC system, and getting a professional diagnostic if needed.

Should I consult a professional mechanic for this issue?

If the steps mentioned do not resolve the issue, it is advisable to consult a professional mechanic for a diagnostic to identify and fix any underlying issues.

How important is regular maintenance for preventing this issue?

Regular maintenance and servicing of your car’s AC system are crucial in preventing issues like car shaking when the AC is on. It helps in early identification and resolution of potential problems.

Can I fix this issue myself, or should I always seek professional help?

While some steps, like checking engine mounts or replacing spark plugs, can be done by individuals with some mechanical knowledge, it is often recommended to seek professional help, especially for more complex issues like compressor malfunction.


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