Is there an important part of the cooling system next to the water pump? Thermostat, when the automobile cold car starts, the thermostat does not open, so that the coolant does not pass through the water tank, but only circulates in the engine. When the temperature of the engine reaches above 85 degrees, it will open. The hot water in the engine is pumped into the water tank, and the cold air when the car is running blows through the water tank, taking away the heat and exchanging heat to cool the engine.
It can be seen that the thermostat is an important part of the engine to control the water temperature, and it is a device to close and open the large circulation of engine coolant. The failure of the thermostat will cause the main valve to fail to open or close normally.
When the thermostat can't be opened normally, the engine can't start a large cycle, and the overheated coolant can't enter the water tank, which leads to the high temperature of the engine. At this time, the temperature and pressure of the coolant are high, which is easy to cause damage to the small circulation system, such as gaskets, heater water tanks and some water pipes.
When the thermostat can't be closed normally, the automobile cooling system has been in a state of large cycle since the cold start. The water temperature will rise slowly, especially in winter, and the hot car will be particularly slow. When the water temperature is low, the signal provided by the water temperature sensor to ECU will increase the fuel injection of the engine, and the car will naturally consume fuel.
The failure of the thermostat mostly occurs in the cracking of the thermostat body or the aging of the hose. The cracking of the thermostat and abnormal cooling water circulation will lead to the rise and boiling of the water temperature. Don't underestimate this widget, once it is damaged, it will easily lead to major failures. Generally, it is not a big problem to use the thermostat for more than 50 thousand kilometers. Thermostats are generally inexpensive and relatively simple to replace. It is not difficult to judge whether the thermostat is damaged, and the owner can tell for himself.
(Photo/Text/Photo: Lai Jianying) @20 19