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What Causes the Abnormal Noise When Starting the Car Air Conditioning?

2 Answers

AliyahFitz

07/29/25 7:32am

Here are several reasons for abnormal noise when starting the car air conditioning: 1. Noise from the dashboard: Usually caused by refrigerant expansion, or the presence of water or air in the refrigerant. Simply replacing the refrigerant can resolve this issue. 2. Excessive refrigerant: In this case, the owner needs to release some refrigerant appropriately. 3. Compressor: Long-term operation of the air conditioning may lead to aging of the compressor. Check if the compressor bearings or internal plungers need replacement. 4. Air conditioning filter: If the air conditioning filter hasn't been replaced for a long time, foreign objects may accumulate in the air ducts, causing abnormal noise. Additional information: If there is abnormal noise when the car air conditioning is turned on, it is recommended to visit a 4S shop for inspection first and then proceed with repairs after identifying the problem.

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SanOscar

08/12/25 10:49am

After driving for so many years, I've encountered quite a few cases of strange noises when the AC starts. The most common issue is a loose or worn compressor belt, which causes a squealing sound during operation, especially noticeable at startup. If the compressor bearings are damaged, you'll hear a grating metal friction noise that's quite unpleasant. Sometimes leaves or small stones get stuck in the fan area, creating a rustling sound when the wind blows, particularly noticeable when the AC is first turned on. Insufficient refrigerant or leaks can also cause noises as the compressor pressure becomes unstable, resulting in a low humming sound. I always make sure to regularly clean the fan vents and check belt tension. Small issues left unattended can turn into major problems - like a burned-out compressor that would cost a fortune to repair. So whenever you notice anything unusual, it's best to get it checked at a professional shop. Safety comes first, and strange noises while driving can be very distracting.

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What does it mean when the car's eco light is on?

When the eco indicator light on the car is illuminated, it indicates that the vehicle's economy mode has been activated. Eco is an English abbreviation derived from the words Ecology (environmental protection), Conservation (energy saving), and Optimization (power). The Eco mode is further divided into active eco driving mode and non-active eco driving mode. Eco mode is categorized into active and non-active types, with the difference being that the active type has its own dedicated button, allowing the driver to choose whether to enable it. When the driver presses the eco mode switch, the dashboard indicator light immediately turns on, and the vehicle automatically begins adjusting settings such as throttle opening, transmission shift logic, and air conditioning output power. Non-active eco mode does not have a dedicated button. When the dashboard eco indicator light is on, it serves merely as a reminder function. The eco system automatically evaluates your driving behavior. If your current driving operation achieves the optimal fuel supply, the dashboard will simultaneously display the eco indicator light. Most vehicles use the active eco driving mode, meaning they have their own switch button. Therefore, during daily driving, we can generally enable eco mode. However, it is unnecessary to activate eco mode when driving at speeds exceeding 120 km/h, during idle parking, in N/P gear, or manual mode, especially when climbing hills. Doing so would not only fail to demonstrate the fuel-saving characteristics of eco mode but also affect the vehicle's power performance. Additionally, eco mode typically becomes ineffective under the following circumstances: When the vehicle speed exceeds 120 kilometers per hour, the system prioritizes speed, causing the eco mode to automatically deactivate. During idle parking or when in N/P gear or manual mode, eco mode may also become ineffective. When high torque output is required, such as when climbing a hill, the engine control unit prioritizes ensuring sufficient power to drive the vehicle, and the eco mode will not function in such scenarios.

What happens if the car in front suddenly brakes and causes a rear-end collision?

The car behind is fully responsible if the car in front suddenly brakes and causes a rear-end collision. Here are some related tips for preventing rear-end collisions: Maintain a safe distance: When driving at speeds over 100 km/h on the highway, maintain a safe distance of more than 100 meters from the car in front. On highways, each dashed lane divider line is 6 meters long, with a 9-meter gap between lines. The distance between two white lines plus the gap is 21 meters, which drivers can use as a simple way to judge the distance. Observe road conditions: When there aren't many vehicles in the overtaking lane, slightly move towards the overtaking lane. The advantage of this habit is that it provides a better view ahead. In case of sudden incidents like accidents or traffic jams, you can take timely measures. Additionally, avoid following vehicles that are too tall or have heavily tinted windows. Alert the car behind: An important driving technique is to alert the car behind you to effectively prevent being rear-ended. Regularly check the car behind you. If you feel it's following too closely, gently tap the brakes to alert them. If traffic ahead is dense and moving slowly, turn on your hazard lights to remind the car behind to slow down.

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Lingdu cold engine starting with extremely loud noise may be caused by intake noise generated by the engine's intake system or abnormal wear of the engine's external belt or pulley. Here is a detailed introduction to the reasons for loud starting noise: Winter Reasons: In winter, the atomization conditions of gasoline are poor, especially for vehicles with carburetors, which are generally difficult to start, and even after starting, they cannot immediately transition to normal working conditions. Therefore, during winter maintenance, it is necessary to clean and unclog all oil and air passages, check the working conditions of the throttle valve, choke valve, accelerator pump, and vacuum pump, and adjust them to the optimal state. At the same time, the idle fuel supply concentration should be appropriately adjusted to ensure normal idle operation in severe cold. Spark Plug Reasons: For the electrical system, mainly check the distributor's platinum gap and the spark plug's electrode gap. The distributor's platinum contacts should be clean without erosion, with a contact surface of more than 70%, and the gap should be between 0.3 to 0.45 millimeters. For models with electronic ignition, the spark plug gap is generally between 0.6 to 0.7 millimeters. If the spark plug gap is too large, the engine is difficult to start when cold. If the gap is too small, the engine's output power decreases, fuel consumption increases, and exhaust emissions exceed standards.

What is the fuel consumption of the Sonata 2.0?

The fuel consumption of the Sonata 2.0 is 9L/100km. Here are the specific factors that affect fuel consumption: Vehicle condition: In addition to keeping the car clean, more attention should be paid to the condition of the car, with regular maintenance and timely repairs. Driving habits: Bad driving habits often waste fuel imperceptibly. For example, carrying too much unnecessary weight in the vehicle, opening windows at high speeds, sudden acceleration, and hard braking can all lead to increased fuel consumption. Impact of driving roads: Driving in urban conditions consumes 20% more fuel than on a test track, mainly due to frequent starts and stops, waiting at traffic lights, gear shifting, and acceleration and deceleration, which all contribute to higher fuel consumption.

Should You Get a Sunroof When Buying a Car?

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How to Pair a Car Remote Key?

Get into the car and close all doors. Open the driver's door, insert the key, and turn it on and off five times in a row. On the fifth time, the hazard lights will flash once. Simultaneously press and hold the lock and unlock buttons on the remote key you want to pair, and press them several times. The hazard lights will flash, and if they flash twice, it means the remote key has been successfully paired. Remove the key and test it to ensure both the lock and unlock buttons are functioning properly. Notes: A. Pairing methods may vary depending on the car brand and model; B. When purchasing a car remote key, choose a reputable and certified brand to prevent data theft.

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