Air Conditioning and Refrigeration System
Air conditioning is a component that is used very frequently during the summer and is also the most prone to failure. The most common failures of air-conditioning systems in air lifts are the leakage of refrigerant and poor cooling.
Refrigerant leakage is usually caused by the aging of the sealing rubber in the pipeline, abnormal refrigerant pressure, and damage to system components. After the leakage fault is repaired, the refrigerant oil must be replenished and the system must be evacuated and filled with refrigerant, freezer oil and refrigerant. Must use good quality and the same type of vehicle requirements. In many poor cooling failures, the most common is the air conditioning system cooling is poor, the need to maintain the project is mainly condenser cleaning and cooling fan working conditions.
At the same time, checking whether the cooling effect of air-conditioner air conditioners is the same as the one at the time of delivery is a must-do item when maintaining air conditioners. This is also an important link in diagnosing whether air conditioners are “healthyâ€. According to Changsha Deshun and Hunan Wanchao Automobile Sales The company’s technical staff introduced the Mazda 6 as an example. Its standard cooling effect is 6.3°C to 8°C. Exceeding this range, either high or low, all indicate that the air conditioning system has problems. Another important aspect of the air conditioning system Components - The air-conditioning filter can effectively filter dust, pollen and bacteria in the air to prevent air pollution inside the air-conditioning system. Car air-conditioning filter with activated carbon coating can also kill bacteria in the air and inhibit bacterial regeneration. However, if too much dust accumulates on the air-conditioning filter, it will not only affect the filtering effect, but also reduce the air throughput and suppress the cooling performance. Therefore, in the maintenance of air-conditioning and refrigeration systems, the air-conditioning filter must Clean up (dust blowing off the duct), can not be cleaned, maintenance personnel will recommend the owner to replace. Battery storage battery use and maintenance should pay attention to the following seven aspects. The first is to check if the battery's fixing bolt on the bracket is tightly tightened. If the mounting is not firm, it will cause damage to the housing due to driving vibration. Second, check the connection between the pole and the wiring head from time to time. To prevent the oxidation of the wiring head, you can apply Vaseline and other protections. Agent; third is not available direct fire (short circuit test) method to check the battery power, this will cause damage to the battery; Fourth, ordinary lead-acid batteries should pay attention to regularly add distilled water; five is the battery cover to keep the open vent; There are yellowish-white pastes around the battery post and lid. This is caused by sulfuric acid corroding the post, line card, and holder. The resistance of these materials is large and must be cleared in time; When two batteries are needed in series, the battery capacity is preferably the same, otherwise it will affect the battery life.
Checking the battery voltage and generator voltage is an important basis for judging whether the two working conditions are normal. The commonly used tool is a vehicle voltmeter. The detection method is very simple. The two interfaces of the voltmeter are connected to the two poles of the battery or the generator, respectively. The readings are their actual voltages. Take the Mazda6 sedan as an example. The battery's standard voltage is 13.31V and the generator voltage is 13.85V. Different from this reading, it indicates that there is a problem with the battery or generator.
According to technicians, general maintenance-free batteries can be stored for about 10 months from the factory to their use, their voltage and capacitance remain unchanged, and the quality of the poor quality of the voltage and capacitance will begin to decline in the factory about 3 months. Brakes and tires here The brake is said to be the handbrake system. The detection is relatively simple. The usual practice is to drive the car to a flat slope (15 degrees to 30 degrees), stop, pull the handbrake, the vehicle is stable, no The backward movement indicates that the handbrake is working properly. If there is no slope suitable for detection, the use state can be judged according to the height of the handbrake.
Tire inspection items for tire pressure and wear, cracking and bulging
Special tire pressure gauges are used for testing aerial tire pressure. If they do not meet the standards, they must be properly vented or replenished to adjust. There are no signs of wear, cracking and bulging from the surface of the tire. The latter two conditions are more characteristic. Obviously relatively easy to find, the wear condition has to be judged based on the tread wear indicator on the tire. As an intuitive marker of the tread condition, the tread wear indicator is molded on the bottom of the tread groove, across the tread width is 13mm In the belt zone, when the tire is worn and the wear indicator mark is exposed, the tire tread depth is 1.6mm. At this time, the tire should be replaced. Otherwise, the tire will slip, resulting in driving hazard.
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