The vehicle air conditioner is not cool during the summer, it is a high-maintenance season. The air conditioner maintenance industry is the classic mode: air conditioner is not cold, air conditioner compressors are directly judged to be damaged, and a price of several thousand yuan is offered for the compressor replacement; the actual failure is only a colder leak, condenser blockage, temperature sensors fail, and hundreds of dollars can be repaired. Compressors are the most expensive component of air conditioners and are also areas of severe over-repair。
Automobile air-conditioning systems consist of compressors, condensers, evaporation tanks, expansion valves, dry bottles, pipes, pressure sensors. Compressors are power cores, with low failure rates. Most air conditioners are not cooled and the source is not compressor damage. Common malfunctions: leakage of refrigerants (freon), dispersing of the surface of the condenser, failure of the dispersing fan, failure of the temperature sensor, congestion of the swelling valve。
It's common to open doors. Set one: air conditioners are not cold, pressure sheets are attached, pressure is abnormal and compressor damage is determined directly. The problem of leaking and dissipation is not addressed. Compressor damage requires detection of compressor compressor compressor adsorption, high-pressure data, not just pressure. Set two: cold-spill leaks, easy treatment of leaks, no leaks at door shop, direct refilling of refrigerants, short-term cooling, short-term leakages, repeated charges of refilling of refrigerants. Leakage is the core, and cold-transmitters alone do not fix the leaks are ineffective maintenance. Set three: air-conditioning tastes like hundreds of dollars to sell evaporation boxes for deep cleaning packages; if only air-conditioning cores are filtered, several dozen dollars can be replaced. Only the evaporation box has a mold, which requires deep cleaning. Set four: exaggerated condensers are blocked, condensers outside willow dust, high-pressure water guns are washed low。
Real cases: owner's air conditioners were not cooled during the summer, the compressor was informed after testing by the repair plant of the damage, and the replacement compressor price was $3800. The owner of the car also looked at the shop and found that the air conditioner circuits were ageing and leaking refrigerants, replacing the seals + adding chillers at a total cost of $360, and the air conditioning was back to normal. It's typically a direct determination of the compressor damage。
The way to avoid pits. First, the order of non-refrigeration of air conditioners: first, see if the air conditioner compressor is adsorbed, check if the dispersor fan is working, whether the condenser is dirty outside, detect the pressure of the air conditioner system, find the cooler leak point, and finally determine whether the compressor is good or bad. Following jane to be difficult, do not directly evaluate the compressor damage. Second, refrigerant leak maintenance:** the leak site must be repaired and refilled; the refrigerant alone is no cure**. Pair test completed for maintenance, confirmed no further leakage. Third, air conditioners smell: the first step is to replace air conditioners filter cores. The change of the filter core will be followed by a stench, which will then consider cleaning the evaporation box. Fourth, cleaning condensers: low-pressure clean water washes, and no high-pressure water pistols rush at close range, which can rip the condenser's wings off and affect the heat. Fifth, if compressors need to be replaced, preference should be given to large brand compressors, distinguishing between brand-news, refurbished compressors, retrofitting compressors with low cost but high failure rates, and the type of spare parts should be documented in advance。
Additional knowledge points: ac cooling has become less effective, often normal in high-temperature tan, and does not amount to failure. Weakly cooled, ran and cooled, and priority was given to checking condensers for blackouts and dispersing fans. The repairs were completed, the test vehicle confirmed the cooling effects, measured the temperature of the wind vent and the normal vent temperature was between 4 and 10 degrees celsius。
Summarize the main points of pit avoidance: ac is not cool and does not directly identify compressor damage; check first the leak points, which is the core of the cold-spill maintenance; air-conditioning is first replaced by air-conditioning filters; condenser low-pressure wash cleaning; replacement compressor identifies the type of fitting. Air-conditioning maintenance is simple to bulky, avoiding mass pits that can easily replace compressors。
