Browse

Antiques Collectibles Apparel Baby Kids Items Books， Movies And Music Electronics Free Stuff Garden Outdoor Health Beauty Home Goods Home Improvement Supplies Musical Instruments Office Supplies Pet Supplies Sporting Goods Ticket Toys Games Transportation Others

Used Cars New Cars Others

Business Crafts Design And Web Events Home Improvement Legal Lessons Personal Pets Photography Repair And Technical Support Wellness Writing， Translation， And Transcription Others

Activities & Groups Artists & Musicians Classes & Lessons Events Friendship & Networking Lost & Found Rideshare Sports Teams Volunteers Travel & Travel Partners Skills & Language Swap Other

Why Does the Car Make Loud Noise When Running the Air Conditioner at Low Speed?

2 Answers

NoahLee

07/25/25 6:50am

There are several main reasons why a car makes loud noise when running the air conditioner at low speed: 1. The air conditioner filter is too dirty, causing excessive noise. 2. There are foreign objects in the blower fan blades. You can try turning on the blower without starting the engine to see if the noise occurs. If the noise appears, it proves the problem lies with the blower. 3. The car's air conditioner fan blades are deformed or the fan motor is damaged. 4. The clutch bearing inside the air conditioner pump is worn, causing the engine noise to increase when the air conditioner is on. This component cannot be replaced separately; the entire air conditioner pump assembly needs to be replaced. 5. Excessive refrigerant (Freon) content. If the refrigerant level is too high, the compressor's load will increase, leading to higher overall load. Check the air conditioner's sight glass: if liquid flows through the window with a few bubbles when the air conditioner is on, the refrigerant level is normal. If there are no bubbles or very few, it indicates an excessive amount.

Was this review help?

20

3

Share

DelBrooke

08/10/25 6:20pm

I've also experienced loud noise when running the AC at low speeds, which is mainly related to the powertrain. At low speeds, the engine operates at lower RPMs. When the AC compressor kicks in, it suddenly increases the load on the engine, forcing it to work harder to drive the compressor, naturally making more noise. Additionally, the cooling fan starts running at high speed to help the condenser dissipate heat, and the combination of these two sounds becomes even more noticeable. Moreover, if the belt is worn or the tension is insufficient, it may produce a squeaking noise at low speeds. I later found this issue most severe when climbing hills with a full car, as the engine is already under strain, and the AC compressor further diverts some power, making the noise so loud that it's hard to hold a conversation. It's recommended to regularly check the belt and cooling system, and if any unusual noise occurs, it's best to visit a mechanic.

Was this review help?

18

5

Share

Expand All

More Forum Discussions

Do You Need to Release the Handbrake When Starting a Mercedes?

The Mercedes GLC is equipped with an electronic handbrake. When you shift to D gear and press the accelerator, the handbrake will automatically release. However, it is still recommended to manually release the handbrake to reduce wear on the brake pads. Introduction to the Handbrake: The parking brake, commonly referred to as the handbrake, functions to provide resistance when the car is parked, preventing it from rolling. The parking brake, also known as the handbrake or the parking gear in automatic transmissions, locks the drive shaft or rear wheels. The force applied by the parking brake is much weaker compared to the main braking system, just enough to keep the car from rolling on a slope. Precautions When Using the Handbrake: Do not pull the handbrake to the highest position, as the handbrake system includes not only steel cables but also nylon ropes. If the handbrake is always pulled to the highest position, the nylon rope will quickly suffer from material fatigue.

What are the causes of steering wheel noise in the Buick Excelle?

Specific causes are introduced as follows: 1. Friction between the steering column and floor mat: This is a relatively common issue. If the aftermarket floor mat is too large and makes direct contact with the steering column, friction will occur as the steering column rotates. Simply adjusting the position of the floor mat or replacing it will resolve the problem. 2. Malfunction of the clock spring inside the steering wheel: Vehicles that have had their steering wheel disassembled require special attention. It could be due to a broken clock spring or an unplugged clock spring connector. Have it inspected, replaced, or secured at a repair shop. 3. Aging of the tie rod end ball joint: This requires replacement of the tie rod end ball joint, and a four-wheel alignment is necessary after replacement. 4. Leaking of the steering gear boot: Replace the boot or reapply grease as a temporary solution. Reapplying grease is only a stopgap measure.

What is the emission standard of the Audi A6L?

The Audi A6L complies with the China VI emission standard. The dimensions of the Audi A6L are 4951mm in length, 1886mm in width, and 1483mm in height, with a wheelbase of 2925mm. The Audi A6L is equipped with three engines: a low-power version of the 2.0-liter turbocharged engine, a high-power version of the 2.0-liter turbocharged engine, and a 3.0-liter turbocharged engine. The low-power 2.0-liter turbocharged engine has a maximum power of 140kW, a maximum torque of 320Nm, a maximum power speed range of 4200 to 6000 rpm, and a maximum torque speed range of 1450 to 4200 rpm. The high-power 2.0-liter turbocharged engine delivers a maximum power of 165kW, a maximum torque of 350Nm, a maximum power speed range of 5500 to 6000 rpm, and a maximum torque speed range of 1600 to 4500 rpm. The 3.0-liter turbocharged engine produces a maximum power of 250kW, a maximum torque of 500Nm, a maximum power speed range of 5400 to 6400 rpm, and a maximum torque speed range of 1370 to 4500 rpm.

What are the pros and cons of the CVT transmission in the Teana 2.0t?

The advantage of the CVT transmission in the Teana 2.0t is a good driving experience, while the disadvantage is insufficient power. Advantages of the CVT transmission: Spacious interior, comparable to other joint-venture sedans in the same price range, providing a good experience. Disadvantages of the CVT transmission: Insufficient power. This is a situation where both pros and cons coexist. Another manifestation of smoothness is sluggish acceleration. During normal driving starts, the engine speed is around 1800 RPM, which is somewhat high. However, the 1.6L naturally aspirated engine only has 135 horsepower and a peak torque of 159 Nm. Presumably, the high RPM is intended to achieve a less frustrating start, but the effect is not great. Within the first 3 seconds of pressing the accelerator, there's a feeling that the car isn't moving. Only after 3 seconds can you feel the vehicle starting to accelerate, and a glance at the speedometer shows only 20 km/h—it's indeed slow! By the 5th second, when entering the mid-range acceleration phase, you can finally feel a clear sense of acceleration. The official 0-100 km/h acceleration time is 12 seconds, but in reality, it might be even slower.

Where is the nameplate located on the Audi A6?

The nameplate of the Audi A6 is located below the engine water channel on the left side of the engine. Pull out the sealing strip and lift the water channel cover to see it. Taking the 2021 Audi A6 as an example: 1. Body dimensions: length 5038mm, width 1886mm, height 1475mm, wheelbase 3024mm. 2. Power: It is equipped with a 2.0L turbocharged engine with a maximum horsepower of 190ps.

Which way to turn the fuel tank cap?

The fuel tank cap is turned to the left to open, and to the right to close. Refueling is a routine task for every car owner. When refueling, it is important to choose reputable large gas stations and select the correct gasoline grade. Different grades of gasoline have varying octane levels; higher-grade gasoline has a higher octane rating, which provides better anti-knock properties. Gasoline is a volatile, flammable hydrocarbon mixture liquid derived from the distillation, cracking, or pyrolysis of petroleum. It is primarily used as fuel for spark-ignited internal combustion engines and consists mainly of organic compounds obtained from crude oil distillation and various additives.

Trending Ranking

Does exceeding 2 months for the second maintenance count as voiding the warranty?

Where is the air pump fuse located in a BMW 740?

Is There a Difference Between a Three-Way Catalytic Converter and a Particulate Filter?

What is the size of the Geely King Kong steering wheel cover?

Why is the Lexus ES reversing camera not displaying?

Can the idle speed of Volkswagen Sagitar be adjusted?

Why does the car's water temperature fluctuate between rising and falling?

What is the function of the head-up display in the BMW X3?

How to Use Vehicle Lights?

How much engine oil should be added to a BMW X1?

More Forum Discussions

What does Volkswagen P0016 fault code mean?

What are the reasons for the unsatisfactory cooling performance of the Buick Excelle's air conditioning?

What are the reasons why the sunshade of Audi A8L cannot be closed?

Is it okay if I forgot to change the engine oil after exceeding 5,000 kilometers?

Help

Cookie

Cookie Settings

© 2025 Servanan International Pte. Ltd.