节温器工作状况正常时，冷起动后发动机应升温迅速，并使发动机在正常温度内工作（有的需其它机构的调节）。当发动机升温缓慢或经常出现过热现象时，应检查是否节温器的故障而导致冷却系统出现异常。如果节温器失效，大致有三种现象。一、节温器失效后卡在大循环状态。节温器 When the thermostat working condition is normal, the engine should warm up rapidly after the cold start, and make the engine work under the normal temperature (some need the adjustment of other institutions). When the engine is slow or often overheating, check if there is a problem with the thermostat and cause the cooling system to malfunction. If the thermostat fails, there are roughly three phenomena. First, after the thermostat card failure in the state of large circulation. Thermostat