我的朋友小刘有一辆拉达轿车。天暖以后，行驶起来发动机温度指示逐渐偏高。他有一位热心的朋友自献高招。主动帮助拆除了发动机上的节温器。结果出门刚行驶了十几分钟，水温表指示到了红线。这位朋友停车检查水箱，发现水箱不热，只有水箱上水室有点温热。于是想探个究竟，便 Xiao Liu, my friend, has a Lada car. After warm days, driving up the engine temperature gradually higher indication. He has an enthusiastic friend who offers his best. Take the initiative to help remove the thermostat on the engine. The results just go out for a dozen minutes, the water temperature meter indicates the red line. The friend stopped checking the water tank and found the water tank was not hot, only the water tank on the water tank a little warm. So I want to explore what exactly, then