What do 'off' and 'on' mean for car air conditioning?

Why does the car make a squeaking sound when braking?

The squeaking sound when braking is the wear noise between the brake pads and the brake disc. It usually disappears after some driving and is considered normal. There are several reasons for brake noise: 1. New car break-in: The break-in of brake pads is an important process. It usually takes a few hundred kilometers of driving before the brakes feel smooth. Newly replaced brake pads need to break in to better integrate with the old disc. Initially, the brakes may feel very hard, and it typically takes a few hundred kilometers before they become smooth. 2. During driving: Small sand particles may get between the pads and the disc, causing friction and noise. This does not require repair; simply driving for a while will allow the small particles to fall out. For noise caused by incomplete break-in, some owners aggressively apply the brakes to speed up the break-in process. While this can quickly wear in the brakes, it also accelerates brake pad wear, effectively reducing their lifespan. It is recommended to drive for a while longer and observe the situation rather than forcing excessive wear on the brake pads.

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What is the purpose of automatic headlights in vehicles?

Automatic headlights are equipped with a photosensitive control system for the front headlights. The central intelligent control box determines changes in light brightness based on the light sensor, thereby controlling the automatic activation or deactivation of the headlights. Below is a related introduction: 1. Principle explanation: Electronic components such as photoresistors act as sensors (installed behind the rearview mirror inside the car, etc.), sending electronic signals to the ECU (Electronic Control Unit, similar to a computer's CPU) to inform it whether to turn the front headlights on or off, or to switch between high and low beams. The ECU then controls the headlights' operation and beam adjustment. 2. Photosensitive control system: Automatic headlights essentially install a photosensitive control system for the front headlights. The central intelligent control box uses the light sensor to assess changes in light brightness, thereby controlling the automatic activation or deactivation of the headlights.

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How often should engine oil be changed if the car is not driven much?

If the car is not driven frequently, the engine oil should be changed every six to eight months. Here is an introduction to engine oil: Classification of engine oil: Automotive engine oil is divided into three types: mineral oil, semi-synthetic oil, and fully synthetic oil. Mineral oil is the most basic and cheapest type of engine oil, generally classified as SJ or below, and is only suitable for low-end cars or some new vehicles. Functions of engine oil: Lubrication to reduce wear: There is rapid relative sliding between the piston and cylinder of the engine, as well as between the main shaft and bearing bush, which can easily cause wear. High-quality engine oil can form a sufficiently thick oil film between the two sliding surfaces, separating the relatively sliding parts to reduce wear. Cooling and temperature reduction: Engine oil can carry heat back to the oil tank and then dissipate it into the air, helping the radiator cool the engine.

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How is a truck overloaded by 20% penalized?

A truck overloaded by 20% will be fined 200 yuan. Here are the relevant provisions: 1. Article 92 stipulates: If a freight motor vehicle carries goods exceeding the approved loading capacity by less than 30%, a fine ranging from 200 to 500 yuan shall be imposed; if it exceeds the approved loading capacity by 30% or violates regulations by carrying passengers, a fine ranging from 500 to 2,000 yuan shall be imposed, and the vehicle may be detained. For transportation unit vehicles that continue to violate after being penalized, the directly responsible personnel in charge shall be fined between 2,000 and 5,000 yuan. 2. Article 48 of the "Road Traffic Safety Law" states: "Motor vehicles carrying goods must comply with the approved loading capacity, overloading is strictly prohibited. The length, width, and height of the carried goods must not violate loading requirements, and the cargo must not be spilled or scattered."

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Will sleeping in a car without opening the windows in winter cause oxygen deprivation?

Yes, it can cause oxygen deprivation. Due to the difficulty of air convection between the inside and outside of the car, carbon monoxide emitted by prolonged engine operation will gradually accumulate inside the vehicle. Additionally, the oxygen in the car will be consumed by the occupants' breathing while carbon dioxide is exhaled. Over time, the oxygen level inside the car will decrease, and the occupants may unknowingly suffer from poisoning and lose consciousness, which can be life-threatening in severe cases. Below are precautions for sleeping in a car: Maintain air convection: Ensure air convection between the inside and outside of the car to allow fresh air to enter for breathing. Besides turning on the external circulation mode, you can also slightly open the car windows. This will not significantly affect the air conditioning effect inside the car while maintaining air exchange between the inside and outside. Lock the doors: When sleeping in the car, make sure to lock the doors securely and store valuable items properly in hidden places to prevent theft.

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What Does the Free First Maintenance at a 4S Shop Include?

Here is an introduction to the first maintenance of a car: 1. Engine: After cleaning and filtering the engine three times, it should ensure that the engine starts easily, runs smoothly, and the exhaust meets standards, with no abnormal noises, water leakage, oil leakage, electrical leakage, or air leakage. 2. Steering: The free travel and toe-in should meet requirements, steering should be light, flexible, and the front wheels should not wobble or deviate when driving. 3. Clutch: The operation should be convenient, separation thorough, engagement smooth, with no abnormal noises, and the hydraulic system should not leak oil. Check the transmission, drive, and front axle for good lubrication, reliable connection, easy gear shifting, and no oil leakage. Inspect the brake pedal and service brake to ensure good braking performance, no deviation or oil leakage, and the inertia proportioning valve works normally. 4. Tire Pressure: The tire pressure should be normal (according to the high and low-pressure standards specified for the same model). Accessories such as the generator, starter, lights, instruments, signal lights, buttons, and switches should be complete, intact, and functioning properly.

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What do 'off' and 'on' mean for car air conditioning?

Why does the car make a squeaking sound when braking?

What is the purpose of automatic headlights in vehicles?

How often should engine oil be changed if the car is not driven much?

How is a truck overloaded by 20% penalized?

Will sleeping in a car without opening the windows in winter cause oxygen deprivation?

What Does the Free First Maintenance at a 4S Shop Include?

What is the best position to adjust the car's small rearview mirror?

What to Do If You Fail the Physical Examination for License Renewal?

Can Car Repairs Be Covered by Insurance?

What Causes the Car to Shake When Warm but Not When Cold?