Summary of Changan Automobile Maintenance Knowledge

Summary of Changan Automobile Maintenance Knowledge

Whether the heating system can work normally in winter is undoubtedly very important. Although the structure of heating system is simpler than that of air conditioning system, it will also fail if it is stopped for a summer. So before winter, try whether there is hot air in the heating system, whether the fan is abnormal and whether the air duct is unobstructed. Sometimes the antifreeze in the warm air water pipe does not flow for a long time, and it condenses and blocks the circulating pipeline. Although it does not affect driving, it is very troublesome to maintain. If there is a problem, you must go to the 4S shop or repair shop in time to repair it.

Note 1: cooling system

We must use antifreeze in winter, especially in the cold north, where the temperature is below zero most of the time. If the cooling system of the engine is ordinary water, it is easy to freeze, which is not conducive to the start of the car and will almost cause serious damage to the engine. According to statistics, cooling system failure is the number one killer of engine failure, accounting for about 60% of the total number of engine failures! Therefore, the use of antifreeze in winter can effectively curb the occurrence of icing events in the cooling system. So don't forget to check the antifreeze in winter.

Generally speaking, it is recommended to replace antifreeze every two years. But if you have ever added ordinary water to antifreeze, the replacement cycle of antifreeze should be earlier, and you should pay attention to the color of antifreeze when replacing it. Different colors cannot be mixed.

As far as the choice of antifreeze is concerned, the lower the freezing point, the stronger the antifreeze. At present, the freezing point of antifreeze in the market has several specifications, such as-15℃, -25℃, -30℃, -40℃ and so on. , and the selected freezing point should be lower than the lowest temperature in this area 10℃ or above.

Note 2: Water spraying system

Even though the usage of wiper spray system will be significantly reduced in winter, it cannot be ignored, especially in the northern region. Like antifreeze, although it can be replaced by clean water and washing water in summer, there are many details in winter.

These substitutes may freeze, so they should not be used in winter. In the environment below zero degrees Celsius in winter, the frost-resistant winter glass water should be replaced, or an appropriate proportion of alcohol should be added to the glass water to achieve the purpose of lowering the freezing point and freezing resistance.

Note 3: Body paint

It is recommended that all car lovers do a full-body "beauty" for their cars before winter. Waxing in early winter is a good way to maintain car paint, because the number of freezing and brushing cars will be reduced after winter. In addition, the waxed car body is not easy to get wet, and the car paint is not easy to condense into ice in winter.

Note 4: Whole vehicle lighting

The working state of the headlights of the whole vehicle should be thoroughly checked, and the black bulbs should be replaced as soon as possible. Fog lights, brake lights and turn signals should be checked by themselves. In the foggy morning in winter, visibility is low, and there are many rear-end accidents, so whether fog lights and high-position brake lights work normally is also the guarantee of driving safety in winter.

Note 5: Power supply system

Here is mainly about the battery. The battery is very sensitive to low temperature, and the capacity of the battery under low temperature environment is much lower than that under normal temperature. Although the existing battery is maintenance-free, there is no need to replenish the battery electrolyte and adjust the proportion of electrolyte. However, before the arrival of the cold season, the terminals of the battery should also be cleaned and coated with special grease for protection, so as to ensure reliable starting and prolong the battery life. If the vehicle is parked in the open air or garage for several weeks, the battery should be taken out and stored in a warmer room to prevent the battery from being damaged.

Note 6: Tires

Rubber will become hard and brittle due to the decrease of air temperature, and the friction coefficient will decrease. The tire pressure should not be too high in winter, but it should not be too low. The external temperature is low, the wheels are low, and the soft tires will accelerate the aging. In winter, it is necessary to clean up the inclusions in the tire tread frequently, try to avoid using tires that have been mended more than once, and replace tires with larger wear and different brands and patterns. The internal and external wear of tires are completely different. In order to ensure safety and reduce wear, the tire should be dynamically balanced with four wheels regularly, and the tire position should be changed.

Note 7: Wiper

If you find that the wiper is stuck to the windshield by snow water in the morning, don't wash it directly with hot water, which will easily cause the window to burst and the wiper to deform due to temperature changes. The correct way should be to turn on the air conditioner with hot air, and the blowing mode is the front windshield. When the wiper turns on naturally, don't forget to add antifreeze glass water to the wiper spray bottle.

Note 8: Windshield

Keeping the windshield clean is the basic condition for safe driving. In winter, the wiper should be scrubbed regularly to ensure that the windshield can be scraped clean in snowy days. If possible, you can replace the antifreeze windshield to avoid freezing in winter. In addition, some windshield deicer can be added to the glass water. When the windshield freezes, spray glass water on it, and the ice will melt, unlike the usual glass water when it freezes.

The defogging circuit of rear window glass plays an important role. When driving in rainy or snowy days, the rear window defogging circuit can quickly remove fog or ice water, thus providing a good rear view for the driver.

During maintenance, the window glass should be wiped along the printed circuit direction, that is, horizontally. If you rub it up and down, it is easy to break the resistance wire.

If you need to check whether the defogging line works, you can turn on the defogging switch on the rear window to see if you can remove the fog on the rear window. If it cannot be removed, first check whether the fuse of the defogging line on the rear window is intact. If the fuse is normal, check the printed circuit on the rear window glass for damage. If it is broken, it should be sent to a repair shop for repair, or the water vapor and dirt in the damaged part should be wiped off with a clean cloth, and then the tin foil for packaging cigarettes should be cut to a suitable size and then pasted.

Note 9: Chassis

Because of the heavy snow and bad weather, sometimes in order to melt the ice and snow as soon as possible, the snow sweeper often sprinkles a lot of salt on the road surface to accelerate the melting of the ice and snow. In this way, the pavement is equivalent to a layer of acidic liquid pavement. When the car is driving on the ice and snow road, the speeding tires will obviously throw the snow water with high salt content onto the chassis of the car. If the chassis is not protected, it will easily lead to corrosion and rust of the chassis. Therefore, you'd better take some time to do the anti-rust care of the chassis before winter. In order to better protect your car. It can also prolong the service life of the car.

Note 10: air intake system

In cold winter, it may often happen that the car can't start. In addition to the insufficient charging of the cooling system and battery, most of the reasons are caused by too much carbon deposition in the throttle and air intake. Too much carbon deposits on the throttle itself can easily lead to ignition failure. In summer, the carbon deposit on the throttle may not affect the engine start, but in winter, due to the low ambient temperature of the vehicle, the gasoline volatilization is affected. Under the same conditions, the gasoline ignition ability is relatively weak, and the engine may not be able to ignite or need multiple ignitions. Therefore, it is recommended that car owners clean the engine throttle carbon deposit in winter.

Under normal circumstances, it is recommended to clean the throttle body every 20,000 kilometers or so and check the spark plug, which can well prevent the engine from catching fire.

Note 1 1: Lubrication system

As we all know, engine oil has three functions of lubrication, cooling and cleaning, and the normal flow of engine oil is an important medium to ensure the normal operation of the engine.

But the realization of these functions is mainly related to the viscosity and fluidity of engine oil. The viscosity of engine oil will change with the change of temperature. In summer, due to the high temperature and good oil fluidity, the engine uses high viscosity oil to ensure proper consistency and effective lubrication. However, the cold weather in winter, especially in the north, is below zero most of the time, which leads to too thick oil in cold cars, which affects the start-up and increases the wear and tear of parts. At the same time, too thin oil will reduce lubrication and sealing performance.