一、节流孔管堵塞诊断所谓CCOT系统(循环离合节流孔管系统)就是以节流孔管为节流膨胀装置的一种汽车空调系统,其储液器是安装在蒸发器后管路上。CCOT主要故障就是堵塞,为了诊断,要装上高、低侧压力表,当空调开关调至最冷(MAX)位置,风机调最高速,车门敞开或引进车外新风,以增加蒸发器负载。当发动机按20000r/min运转,此时,低压侧压力表显示不正常的低压、或显示真空。那就是孔管堵塞现象之一。 First, the diagnosis of choke tube blockage The so-called CCOT system (circulated choke choke tube system) is to throttle the expansion device for a car air-conditioning system, the reservoir is installed in the evaporator after the pipeline . CCOT main fault is blocked, in order to diagnose, to be fitted with high and low side pressure gauge, when the air conditioning switch is adjusted to the coldest (MAX) position, the fan speed is high, the door open or the introduction of fresh air outside the car to increase the evaporator load. When the engine is operated at 20000 r / min, the low side pressure gauge shows an abnormally low pressure or a vacuum is displayed. That is one of the blocked tube phenomenon.