What Causes the Abnormal Noise in BMW 3 Series Air Conditioning?

1 Answers
JuniperLynn
07/30/25 2:27am
There are several reasons for abnormal noise when the car's air conditioning is turned on: 1. Damaged compressor belt tensioner; 2. Excessive wear or damage to the blower motor; 3. Malfunction of the internal/external circulation motor; 4. High pressure in the air conditioning system; 5. Improper engagement of the compressor clutch; 6. Prolonged non-replacement of the air filter. Belt noise: We know that the air conditioning compressor is generally driven by the engine crankshaft via a belt. When the belt is loose, aged, severely worn, or the tensioner's force is insufficient, it can cause the belt to slip or operate unevenly, resulting in a rattling noise. Air conditioning compressor damage: The refrigerant in the air conditioning system needs to be compressed by the compressor to convert low-temperature, low-pressure refrigerant into high-temperature, high-pressure gas, which is then liquefied and cooled by the condenser. When the internal components of the air conditioning compressor are damaged, it can also produce a rattling noise.
Was this review help?
11
2
Share
More Forum Discussions

Is there no good license plate number in Tianjin's 50-choose-1 selection?

Tianjin's 50-choose-1 license plate selection may have good numbers, as they are randomly assigned, and the perception of good or bad numbers is largely subjective. Understanding the processing time: The processing time for self-selection and one-time selection is 5 minutes. If no selection is made the first time, you can try again after five minutes. When self-selecting, make full use of the selection rules by preparing three preferred numbers in advance and entering them in order on the selection machine. If all three entered plate numbers are already taken, you can use the similar number query function. The selection system will then provide 6 similar numbers based on the rules of the first number entered, from which you can choose. Pre-selection screening: The 12123 online vehicle management platform has a limited number of selection attempts, usually 20 times. Once the attempts are exhausted, you can no longer select online and must go to the vehicle management office for the 50-choose-1 selection. You can screen for occupied numbers in advance to accurately filter out which desired number combinations are still available, thus avoiding wasting your self-selection attempts.
8
3
Share

Do Pearl White and Polar White Look the Same?

Pearl White and Polar White look different. Pearl White is a metallic paint, which is more expensive to repair later but has very high brightness and is quite beautiful; while Polar White is an ordinary white paint, easier to repair and at a lower cost. The differences between Pearl White and Polar White: Pearl White paint contains fluorescent powder, which reflects bright fluorescent particles under sunlight, whereas Polar White does not have fluorescent powder. The paint is pure white from inside out and does not emit fluorescent particles under sunlight. Additionally, Pearl White is more costly than Polar White. Polar White is a standard paint, appearing pure white to the naked eye because it does not contain fluorescent powder, thus it does not reflect fluorescent particles under sunlight and is easier to maintain. In terms of cost, Pearl White paint is more expensive to formulate, mainly due to the labor-intensive process involved in repair, filling, spraying, and polishing, which requires multiple steps. Moreover, spraying Pearl White is more challenging, with high demands on paint thickness control and uniformity. Achieving a seamless repair without color differences requires advanced technical skills. On the other hand, white paint formulation is less complex, making it cheaper than Pearl White. White paint does not contain any reflective or brightening additives, relying solely on the outer clear coat for brightness, making it easier to care for and maintain.
19
1
Share

Does the Mercedes-Benz E-Class have a station wagon version?

Mercedes-Benz E-Class does have a station wagon version. Here is an introduction to the Mercedes-Benz E-Class station wagon: 1. In terms of appearance, the new Mercedes-Benz E-Class station wagon basically follows the design style of the new Mercedes-Benz E-Class sedan, adopting the latest design language of the Mercedes-Benz family. Some details are inspired by the Mercedes-Benz S-Class, giving it an overall stable and sophisticated feel. 2. The station wagon version offers three different front grille designs: louver-style, double-bar style, and AMG-Line style, adding a touch of sportiness while maintaining its stable character. 3. Compared to the sedan version, the station wagon's taillights are more slender, featuring LED light sources inside, and the exhaust adopts a dual-exit design, contributing to a very comfortable overall appearance. 4. The interior design, configuration, and materials of the new Mercedes-Benz E-Class station wagon are the same as those of the sedan version, with the trunk area being the highlight of the station wagon model. 5. In terms of power, the new E-Class station wagon uses the same powertrain combination as the sedan version, equipped with either a 2.0T or 3.0T turbocharged engine. It is paired with a 9-speed automatic transmission, delivering excellent overall performance.
14
0
Share

Can a new car go on the highway after running-in for 1000 kilometers?

A new car can go on the highway after running-in for 1000 kilometers. However, the speed should not exceed 100km/h. Still, it is necessary to pay a little attention, after all, the car needs a certain running-in period, and the first 1000 kilometers are still relatively critical. Definition of highway: Highway refers to high-level speed, compared to medium speed and low speed. In an environment where low speed is dominant, low speed is ordinary speed or normal speed, while in an environment where medium speed is dominant, medium speed is ordinary speed or normal speed. Precautions for driving on the highway: When driving on the highway, it is necessary to maintain a safe distance from the vehicle in front. When the speed is above 100km/h, keep a distance of more than 100 meters. There are distance confirmation signs on the highway, through which the distance can be confirmed. Stay away from trucks; when driving at high speed, do not drive side by side with trucks, nor follow behind trucks, try to overtake them. Keep driving in the middle lane; the leftmost lane on the highway is the overtaking lane, and large trucks are generally in the rightmost lane.
3
1
Share

What Happens If You Overfill Engine Oil?

Overfilling engine oil can lead to increased fuel consumption, reduced power output, failure to meet environmental standards, shortened oil seal lifespan, and may cause engine oil leaks. The consequences of excessive oil addition are detrimental. Excess oil increases the crankshaft's rotational resistance, reduces engine output power, and the surplus oil may enter the combustion chamber, leading to oil burning, blue smoke emission, and consequently increased fuel consumption. The primary functions of engine oil are to reduce friction and wear between moving parts, remove sludge (one of the dispersant's roles) and varnish (cleaner's role) from the engine, neutralize acids produced from fuel and lubricant oxidation (cleaner's role), improve piston ring sealing, and cool the engine by carrying away heat from moving components.
16
5
Share

How to Identify Tire Pressure Markings on Tires?

Tire pressure markings can be found on the sidewall of the tire. These markings indicate the maximum allowable pressure, not the recommended pressure. For example, a common marking might be '340 kPa,' which translates to 3.4 bar. According to national standards, tire sidewalls must display the production number, manufacturer's trademark, size specifications, load rating, maximum load and corresponding pressure, ply composition code (in Chinese Pinyin), installation requirements, and directional indicators. Strictly speaking, tire pressure refers to the air pressure inside the tire—essentially the 'blood pressure' of a car. The level of tire pressure plays a crucial role in a vehicle's performance and power.
11
5
Share
Cookie
Cookie Settings
© 2025 Servanan International Pte. Ltd.