故障现象一辆宝马X3车,前部乘客侧空调无暖风。故障诊断接车后首先验故障现象,起动发动机,使发动机达到暖机状态;将驾驶人侧空调和前乘客侧空调的温度均设置为28°C(最高温度),发现驾驶人侧空调出风口有暖风吹出,而前乘客侧空调出风口吹出的是自然风。t用故障检测仪检测,无故障代码存储。检查发动机冷却液液位,正常;排尽发动机冷却系统中的空气后试车,故障依旧。用手触摸暖风热交换器的进液管与出液管,发热 Symptom A BMW X3 car, the front passenger side air conditioning without heating. Fault diagnosis After the first pick-fault phenomenon, start the engine, the engine to warm state; the driver side air conditioning and front passenger side air conditioning temperature are set to 28 ° C (maximum temperature) and found that the driver side air conditioning outlet There is a warm air blowing, while the front passenger air conditioning air outlet is the natural wind blowing. t Fault detector detection, fault-free code storage. Check the engine coolant level, normal; exhausted after the engine cooling system air test, the fault still. Hand touch the warm air heat exchanger inlet and outlet tube, fever