推荐回答（1个）
1、检查车辆水温偏高的原因，首先要做的就是检查水箱内的冷却水是否充足，其次检查水箱外表面是否积聚了大量灰尘和杂物。特别是在北方地区，因为风沙大的缘故，大致水箱散热片的表面吸附了大量灰尘，此外对于长期在高速路况下行驶的车辆，大量的昆虫尸体同样会粘附在水箱散热片表面，两种情况是导致水箱散热不畅的常见问题。解决方法为，用高压水枪对表面进行冲洗，使之达到清洗散热片表面的目的。另外一点，水箱内部因长期密闭装有防冻液或水，出现的水垢也会影响散热效果，这时需要做的则是清晰散热器内部和发动机水套，具体方法可向内部加注适量的除垢剂。 2、接下来要检查水箱进、出口橡胶管有无凹陷、起层、堵塞等问题。橡胶管在长时间的使用时，因为内壁起层会影响冷却液的循环。 3、检查辅助水箱散热器的电子扇工作是否正常，着重检查电子扇本身是否会视工况负载情况，做高低速切换。此外还应观察电子扇的扇叶是否有变形问题，最后检查风扇胶带的松紧度，一般方法为用拇指施加30-50N的力按压胶带的中部，胶带的挠度应为10-15mm。 4、节温器是发动机大小循环的切换开关，为纯机械机构。一旦节温器出现了故障，会直接导致温度升高从而发生“开锅”的问题，这是因为它是一个纯机械的部件，利用石蜡受热膨胀的原理，在填满石蜡的容器中布置一根金属片，在温度超过一定数值时候石蜡膨胀，将金属片顶开，此时，切换到冷却的大循环状态，这个时候发动机中的高温冷却液开始由进水管进入散热器，热交换结束后又从出水管流回发动机水套内，进而实现降低水温的作用。根据它的结构我们能够判断，所谓的节温器故障也不外乎就是打不开或者不正常的经常打开。那么，当节温器打不开的时候，金属片始终将进水管封闭，冷却液也就始终处于小循环的状态，这样一来，温度逐渐升高的冷却液无法进行热交换，水冷系统的作用也就没有得到本质的发挥，发动机转速的不断提高，冷却液的温度也开始迅速升高。 5、水温传感器相当于体温计，车辆行驶中他可以时时的监控冷却液的工作温度，并将电压信号传递给ECU，从而由ECU发出指令修正调节发动机喷油量，如果水温器发生故障造成电压信号传递中断会直接影响ECU对车冷却液水温的监控。(转)
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