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What causes the loud noise from the BMW 5 Series electric fan?

1 Answers
DeGabriel
07/29/25 7:37pm
The reasons for the loud noise from the BMW 5 Series electric fan are as follows: 1. Carbon deposits: As old engine oil becomes thinner with use, carbon deposits accumulate more and more. Thinner engine oil can easily lead to oil leakage, resulting in increasing carbon deposits and significant power loss. When new oil is added, the engine may not adapt to the viscosity of the new oil, potentially causing higher RPMs, which in turn leads to louder engine noise. 2. Coolant: When the coolant temperature is too low, problems are likely to occur, and the engine noise may increase. In such cases, it is advisable to check and replace the coolant to avoid other issues. 3. Shock absorbers: Generally, when driving over speed bumps, you can feel whether the vehicle's shock absorbers are functioning properly. If there is an issue with the shock absorbers, it can result in louder engine noise.
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More Forum Discussions

What are the symptoms of a burnt clutch plate in a car?

A burnt clutch in a car can cause symptoms such as sluggish acceleration, reduced power, and slipping during startup. Below are some related details about a burnt clutch: 1. The clutch needs to be lifted higher than before: Normally, the car moves as soon as the clutch is slightly lifted after shifting gears. Now, the car only moves after lifting the clutch by two centimeters, indicating that the clutch plate has worn thin and requires a higher lift to engage. 2. Sluggish acceleration: This is most noticeable during high-speed overtaking. When you press the accelerator hard to overtake, the response is delayed, and it feels like the engine is revving without the car accelerating. For instance, the car used to reach 80km/h at 1800 RPM, but now it requires 2000 RPM. This situation indicates clutch slippage.
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What is the difference between an auto trade invoice and a 4S store invoice?

Since auto trade invoices are not issued by 4S stores, the vehicle cannot be reported as retail and can only be warranted locally. Other 4S stores may not recognize it. Auto trade cities often collaborate with 4S stores in other locations, so it's important to clarify where the vehicle will be picked up before purchase, as registration will affect the first warranty service. How to distinguish between auto trade invoices and 4S store invoices: 1. Check the watermark: Genuine invoices are printed on special anti-counterfeiting paper with black and white watermarks, which have a noticeable raised texture when touched. Fake watermarks have a weaker raised texture and appear blurry. 2. Prize area difference: The prize area covering on genuine invoices uses laser gold-stamped film with a matte finish, while most fake invoices have inferior covering technology in the prize area, making it harder to scratch off. 3. Color difference: Genuine invoices have a deeper color, appearing pinkish, while fake invoices are much lighter and look somewhat pale.
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Can a Dead Car Battery Be Restored?

If your car battery is dead, you can restore its normal charge by driving for one to two hours under normal conditions. Here are specific solutions: 1. Push-start with human power: The driver sits in the car and operates it while four others push the car from the front, back, left, and right. Once the car reaches a certain speed, the driver shifts into first gear. 2. Towing by another vehicle: Select a rope of appropriate length and securely tie the front and rear of both vehicles together with tight knots. The driver of the front vehicle should slowly tow the rear vehicle. Remember to drive slowly when using this method to prevent the rear vehicle from suddenly accelerating toward the front vehicle.
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Can You Shift Gears While the Car is Moving?

Generally, you can shift gears while the car is moving. Here are the relevant details: 1. Gear Shifting: Gear shifting (changing gears) refers to the transmission, which is used to change the torque and speed of the engine crankshaft to meet the different needs of driving wheel traction and speed under various driving conditions such as starting, accelerating, driving, and overcoming road obstacles. 2. Function: It allows the car to drive at a very low and stable speed, which is difficult to achieve with the minimum stable speed of an internal combustion engine alone; the reverse gear of the transmission enables the car to move backward; the neutral gear allows the engine to be separated from the drivetrain for extended periods during engine startup, parking, and coasting.
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At what temperature will a tire burst?

Tires can generally withstand a maximum temperature of 121.1°C. Daily inspections to prevent tire blowouts are as follows: 1. Regularly check if the tire has reached the wear indicator warning line: Normally used tires should be replaced immediately when worn to this mark. 2. Check the tire pressure at least every two months: Do not rely solely on visual inspection of the sinking amount. If insufficient pressure is found, identify the cause of the air leakage. 3. Frequently inspect the tires for damage: For example, check for punctures or cuts. Damaged tires should be repaired or replaced promptly. 4. If the two front tires have been repaired: They should be promptly adjusted to the rear wheels to ensure the front wheels are free from any hidden dangers. Remove stones from the tread grooves in time to prevent deformation of the tire crown. 5. Avoid contact of tires with oils and chemicals. 6. Regularly perform four-wheel alignment checks on the vehicle: If poor alignment is found, correct it promptly; otherwise, it may cause irregular tire wear and affect the tire's service life.
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What are the raw materials for automotive urea?

Automotive urea refers to a urea aqueous solution with a urea concentration of 32.5% and a solvent of ultra-pure water. The raw materials are specialized automotive urea materials and ultra-pure water. Automotive urea is an essential product for heavy-duty diesel vehicles to meet the National IV emission standards. Here is relevant information about automotive urea: 1. Introduction: Heavy-duty trucks, buses, and other diesel vehicles must adopt suitable SCR systems for exhaust treatment to meet the National IV emission standards. This system requires the use of a urea solution to treat nitrogen oxides in the exhaust. Therefore, automotive urea solution has become an essential product for heavy-duty trucks and buses to comply with the National IV emission standards. 2. Usage Instructions: Automotive urea must use Grade 1 ultra-pure water from the electronics industry. Since the SCR catalyst carrier is highly susceptible to metal ion poisoning, which would deactivate the catalyst, automotive urea solution must use Grade 1 ultra-pure water from the electronics industry. The automotive urea solution begins to freeze at -11°C and completely solidifies at -20°C in practical use. Current technologies involve adding modifiers to lower the freezing point of the solution and external heating devices to prevent solidification.
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