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What does the first-level maintenance of a car refer to?

1 Answers

MacKing

07/24/25 12:55am

First-level car maintenance refers to maintenance operations centered on cleaning, lubrication, and fastening. It mainly involves cleaning internal sediments and inspecting safety-related components such as brakes and controls. These operations are performed by maintenance companies when the car has traveled between 1,500 km and 2,000 km. The tasks involved in first-level maintenance include: 1. Thoroughly washing the car to ensure the engine and chassis are free of oil and dirt after wiping; 2. Cleaning the engine oil, gasoline, and air filters; 3. Checking and adding lubricating oil to the engine oil pan, transmission, rear axle, and steering gear; 4. Lubricating the water pump, distributor, steering rod ball joint, clutch pedal bracket pin, drive shaft, front and rear leaf spring pins, and door components; 5. Inspecting and tightening connecting bolts and nuts on the engine, chassis, and exterior of the car body; 6. Checking and adjusting the drive belts of the air compressor and generator; 7. Inspecting and adjusting the free play of pedals, steering wheel clearance, front wheel bearings, and steering knuckles; 8. Checking and tightening the U-bolts of front and rear leaf springs, transmission, drive shaft, main reducer, and axle connecting bolts; 9. Inspecting the engine hood, radiator rods, louver control mechanism, and the doors, windows, and seats of the cab or passenger compartment.

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Should You Use External or Internal Air Circulation When Turning on the Heater in the Car During Winter?

When turning on the heater in the car during winter, start with internal air circulation and switch to external air circulation once the car is warm. It is recommended to primarily use internal air circulation with occasional external air circulation, alternating between the two. This ensures the car stays warm while preventing a rise in carbon dioxide levels inside the car, which could affect driving safety. For long-distance trips, it is advisable to use external air circulation; in heavy traffic, switch to internal air circulation; and in dusty areas, use internal air circulation. To quickly heat up the car in winter, start the engine and drive normally for a while to allow the engine to warm up. Once the temperature gauge needle reaches the middle position, turn on the heater with internal air circulation. Using internal air circulation helps the air conditioning system rapidly cool or heat the car interior. This not only warms up the car quickly but also reduces engine load and saves fuel.

Should You Engage the P Gear or Pull the Handbrake First When Parking an Automatic Transmission Car?

When parking an automatic transmission car, it is acceptable to either pull the handbrake first or engage the P gear first. Below are specific details regarding parking: 1. On flat ground, whether you pull the handbrake first or engage the P gear first will not cause damage to the vehicle's transmission. This mainly depends on individual parking habits. 2. On steep slopes, you can use the method of pressing the brake, shifting gears, pulling the handbrake, turning off the engine, and then engaging the P gear, which has minimal impact on the transmission. Additional Information: An automatic transmission eliminates the need for the driver to manually shift gears, as the vehicle automatically selects the appropriate gear based on driving speed and traffic conditions. Typically, automatic transmission cars have six gear positions, arranged from top to bottom as follows: P, R, N, D, S, L.

What does the BMW AC button mean?

BMW AC button is the cooling switch of the car air conditioning. Pressing the AC button activates the cooling function. When the AC light is on, it indicates that the car air conditioning compressor is running and the air conditioning is cooling. If the AC light is off, it means the compressor is not working and the air conditioning cooling function is currently turned off. BMW's vehicle series include 1 to 8, X, M, Z, i and others. Among them, the 1 Series is a compact car, the 2 Series is a compact coupe, the 3 Series is a mid-size car, the 4 Series is a mid-size coupe, the 5 Series is a full-size car, the 6 Series is a full-size coupe, the 7 Series is a luxury D-segment car, the 8 Series is a luxury coupe, the i Series is BMW's electric and hybrid vehicle series, M represents BMW's high-performance and sports car versions, the X Series is BMW's dedicated SUV series, and the Z Series is BMW's entry-level sports car.

How long is appropriate for vehicle warm-up time?

In winter, the warm-up time for a car should be controlled within two minutes, while in summer, 30 seconds to one minute is sufficient. Here is some relevant information: 1. Transporting engine oil: After the vehicle has been parked for a long time, the engine oil flows back into the oil pan, leaving the upper part in a state of insufficient lubrication. Warming up the car transports the oil to the pistons, connecting rods, and crankshaft components that need lubrication. 2. Vaporizing the oil: When the engine has not reached its operating temperature, the fuel supply system, due to the low temperature, cannot effectively vaporize the gasoline completely. 3. Lubricating gears: When the car is cold, the gear oil flows to the lower part of the transmission. Only when the car is moving does the operation of the gears bring up the gear oil from the bottom to lubricate the upper part.

What are the reasons for difficult cold starts in cars?

There are three main reasons why a car has difficulty starting in cold conditions. The details are as follows: 1. Fuel pressure regulator failure: The fuel pressure in the fuel system directly affects the concentration of the air-fuel mixture. 2. Coolant temperature too low: When the coolant temperature is too low, the engine will increase the fuel injection volume based on the signal transmitted by the temperature sensor. Due to the temperature, it can also be difficult to start at this time. Therefore, it is necessary to replace the antifreeze in a timely manner according to climate changes. 3. Excessive carbon deposits: When there is too much carbon buildup inside the engine, the gasoline sprayed by the cold start injector will be largely absorbed by the carbon deposits, resulting in an overly lean air-fuel mixture during cold starts and making it difficult to start. Only when the carbon deposits are saturated with absorbed gasoline does the car become easier to start.

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