题目：长安之星发动机水温高故障诊断维修方案目录1.问诊试车...........................................................................................................................11.1车辆信息.................................................................................................................11.2故障现象.................................................................................................................21.3故障确认.................................................................................................................22.故障原因分析...................................................................................................................22.1发动机冷却系统工作原理.....................................................................................22.2原因分析.................................................................................................................22.2.1冷却液液面过低..........................................................................................22.2.2水箱或水循环管路破损..............................................................................22.2.3冷却风扇故障..............................................................................................22.2.4节温器故障..................................................................................................22.2.5水泵故障......................................................................................................23.诊断流程方案设计及实施...............................................................................................33.1发动机高温诊断流程方案.....................................................................................33.2诊断方案实施.........................................................................................................43.2.1观察冷却液..................................................................................................43.2.2使用打压表给水箱打压..............................................................................43.2.3修复破损水管...................................................