[Auto maintenance knowledge]Inspection method of automobile air conditioner

Observation Expansion valve outlet to refrigerationcompressorThe hose in between should be cold and not frosted. Under normal circumstances, the frost will immediately melt away. What you can see with the naked eye is only the drops of water dripped after defrosting. Observe the glass window on the dryer tank, make the engine run at low speed before observing, set the temperature adjustment knob to the maximum cooling level, and exhaustfanRun at high speed for more than 5 minutes, and then observe the flow of refrigerant in the glass window to determine the amount of refrigerant.The specific essentials are: when the amount of refrigerant is appropriate, the performance is generally transparent, increasing or decreasing the engineRotating speedA small amount of bubbles appear when the refrigerant is insufficient; when the refrigerant is insufficient, the flow of bubbles is often seen, and the refrigerant is milky white and turbid; when the refrigerant is small, why can not be seen; when the refrigerant is excessive, the bubbles are invisible; the refrigerant is mixed When air is present, large bubbles can be seen. The refrigerant has strong permeability, and it contains more or less refrigerating machine oil. Therefore, there may be a little oil stain in the leaking place. Touch method Touch by handcompressorUnder normal circumstances, there should be a significant temperature difference between the suction valve and the exhaust valve, and the suction valve is cooler, and the exhaust valve is hot; touch it by handCondenserThe inlet pipe (upper) and the outlet pipe (lower). Under normal circumstances, the inlet pipe is hotter than the outlet pipe; touch the front and rear pipes of the filter dryer by hand, and the temperature should be the same under normal circumstances; touch the front and the front of the expansion valve by hand. In the back part, there should be a significant temperature difference under normal conditions, and the front is hot and the back is cool;CondenserThe refrigerant between the output pipe and the input port of the expansion valve is in the middle temperature and high pressure area, and the temperature of all pipe components should be uniform. <car repairMaintenance Auscultation 　　beltIf it is too loose, there will be abnormal sliding noises or screams, and the cooling efficiency will be reduced at this time;compressorWhen the fixing bolts and bracket installation bolts are loosened, there will be a shaking sound; the exhaust valve is damaged, the moving parts are worn or loose, and the compressorclutchMechanical noise will occur when the freezer is slipping and the freezer is insufficient. When the air conditioner is turned onswitch, When the compressor starts to work, the engine sound will increase slightly, which is normal. Measurement method To understand more accuratelyCar Air ConditionerWhether the system is working normally, it is necessary to test the system with the help of a pressure gauge, and connect the pressure gauge set with hoses to the compressor suction and discharge joints. Related: ·[carRepair knowledge]Common causes of vehicle cold start idling jitter
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