Dongfeng is popular. The sewer pipe is not hot. 50 kilometers is not hot. What happened?

It may be that the thermostat is always on, which causes the coolant to circulate throughout the system, so it takes a long time for warm air to come up! The standard is that when the engine is started, the thermostat is closed and the engine heats up quickly. When the temperature rises to the factory set temperature, the thermostat is turned on and the whole cooling system begins to circulate!