How to Deal with Water Damage in the Car's Central Control Screen?

Does the BMW 3 Series Need to Turn on AC When Using the Heater?

When using the heater in the BMW 3 Series, there is no need to turn on the AC. AC stands for Air-conditioning, which is used for cooling. In the summer, pressing the AC button activates the compressor, which compresses air to blow cold air. However, in winter, the car needs warm air to raise the interior temperature to a comfortable level. The warm air is provided by the engine, which generates a significant amount of heat while running. This heat is simply directed into the air conditioning system, allowing warm air to be blown out through the vents, so there is no need to press the AC button. Using the heater in winter does not increase fuel consumption. The warm air comes from the engine's heat, which would otherwise be expelled outside the car. In a way, using the heater in winter can even reduce the load on other components, such as the engine's cooling system. However, it is important to note that you should not keep the heater on for too long in winter, as the engine's heat also produces harmful gases that can enter the cabin through the air conditioning system. Therefore, it is advisable to open the windows periodically to ventilate the car and minimize potential harm to the occupants.

17

3

Share

Why does a car repeatedly and automatically unlock for no reason?

The reason for the car doors automatically locking is due to the car's own settings or the central control settings. Precautions during vehicle operation are as follows: 1. Driving distance: When driving on the road, it is important to maintain a safe distance between vehicles. According to relevant tests, when braking suddenly at a speed of 100 km/h, even the best cars require nearly 40 meters of braking distance. Even if the speed during normal city driving may not reach 100 km/h, it is still impossible to guarantee that the vehicle can stop immediately and steadily. 2. Overtaking and lane changing: Novice drivers are generally hesitant to overtake. Different road sections and conditions require different driving methods for overtaking. If there are no special circumstances, try to overtake from the left side. 3. Strictly prohibit answering phone calls while driving: Answering phone calls while driving is a dangerous factor that can lead to accidents. Experiments have shown that a driver's attention can decrease by 20% to 70% during a call. Even if some vehicles are equipped with hands-free systems, if answering calls distracts the driver and reduces attention to the vehicle and surrounding environment, the risk of accidents inevitably increases.

16

5

Share

How many engine displacements does the Chevrolet Sail have?

Chevrolet Sail has two engine displacements: 1.4L and 1.2L. Displacement is a hydraulic transmission term, referring to the volume of fluid inhaled or discharged per stroke or cycle. Below is relevant information about the Chevrolet Sail: Dimensions: The Chevrolet Sail has a body size of 4450mm in length, 1748mm in width, and 1493mm in height, with a wheelbase of 2570mm. Appearance: It is newly designed with Chevrolet's next-generation design language, featuring a sleek and elegant exterior, refined and stylish interior, and a more spacious and comfortable cabin. In terms of exterior styling, the Sail 3 front face adopts the brand-new family-style upper and lower dual grille, proportionally divided for a sporty look with horizontally widened treatment, complemented by piercing eagle-eye headlights. The body's diving posture is enhanced by rich three-dimensional surfaces, adding a youthful and dynamic visual effect. At the rear, the Chevrolet dual "C" element taillights are not only aesthetically pleasing but also easily recognizable.

20

4

Share

Why is valve clearance necessary?

Valve clearance is set to ensure the normal operation of the internal combustion engine's valve train. Since the valve train operates at high speeds and elevated temperatures, the valves will expand due to heat. If there is no clearance or insufficient clearance between the valve and its transmission components when cold, it can cause gas leakage during the compression and power strokes, leading to reduced engine power and, in severe cases, difficulty in starting. To prevent this phenomenon, a certain clearance is intentionally left between the end of the intake/exhaust valve stem and the adjusting screw of the tappet (or rocker arm) during the design of the valve train, compensating for the thermal expansion of the valve. Below is relevant information about valve clearance: Valve clearance size: The valve clearance is generally determined by the engine manufacturer through experiments. Typically, when cold, the intake valve clearance is 0.25–0.30mm, and the exhaust valve clearance is 0.30–0.35mm. If the clearance is too small, the engine may experience gas leakage when hot, resulting in power loss or even valve burning. If the clearance is too large, impacts may occur between transmission components and between the valve and valve seat, causing unstable operation of the entire valve train, increased noise, and reduced valve opening duration, leading to insufficient intake and exhaust.

17

2

Share

What is the capacity of a car battery?

Generally, the capacity of household car batteries ranges between 54-60Ah. Car battery capacity refers to the amount of electricity the battery can discharge under certain conditions (discharge rate, temperature, termination voltage, etc.). Functions of a car battery: It supplies power to the starting system, ignition system, and electronic fuel injection system during engine startup; provides power to car electrical equipment when the engine is off or at low idle; acts as a voltage stabilizer for the vehicle's electrical system; and stores excess electrical energy generated by the alternator. Maintenance of a car battery: Avoid parking the car in open parking lots for extended periods. If long-term parking is necessary, remove and take the battery to prevent freezing damage; car batteries should be charged regularly as prolonged disuse leads to gradual self-discharge, eventually causing failure. Therefore, start the car periodically to recharge the battery; clean the battery terminals regularly and apply special grease to protect the wiring harness; frequently inspect battery accessories and connecting circuits; avoid using car electrical appliances after the engine is turned off, as using the battery alone when the engine is not generating electricity can cause damage.

20

5

Share

What does NVH mean?

NVH is the English abbreviation for Noise, Vibration, and Harshness. Below is relevant information about automotive NVH: The role of NVH: NVH is a comprehensive issue that measures the manufacturing quality of automobiles, providing the most direct and superficial experience for car users. NVH issues in vehicles are one of the concerns for major automotive manufacturers and component companies in the international automotive industry. Internal relationships of NVH: The generation of automotive vibration and noise is not independent but closely interrelated. It can be said that noise originates from vibration, and these three factors—vibration, noise, and comfort—are closely connected. It is necessary to reduce vibration and noise while improving ride comfort, ensuring product safety, environmental friendliness, and performance. Characteristics of NVH issues: NVH issues are systemic. For example, if a car's cabin noise is loud while driving, and the source is traced back to the engine, this noise problem may involve three aspects: first, the engine itself is noisy; second, the vibration damping effect of the engine mounting components is poor; and third, the sound insulation technology of the cabin front wall and floor is inadequate.

6

3

Share

How to Deal with Water Damage in the Car's Central Control Screen?

Does the BMW 3 Series Need to Turn on AC When Using the Heater?

Why does a car repeatedly and automatically unlock for no reason?

How many engine displacements does the Chevrolet Sail have?

Why is valve clearance necessary?

What is the capacity of a car battery?

What does NVH mean?

Is a 6-speed manual-automatic transmission an AT transmission?

Will a Manual Transmission Car Stall If You Press the Brake Without Pressing the Clutch?

What Does Crossover Vehicle Mean?

What are the methods for beginners to press the accelerator?