If the heater tank is not blocked, the water will not be hot.

It may be that the thermostat is broken, which leads to the large cycle of the refrigeration system prematurely, resulting in the warm air not being hot.

Symptoms of thermostat damage include:

1. If the thermostat can't be opened, it will appear that the water temperature meter shows that the water temperature is in the high temperature area, but the fan of the water tank doesn't turn, the engine temperature is high, and it is easy to lack antifreeze.

2. If the thermostat is not turned off, the water temperature will rise slowly, especially in winter when the water temperature is still in the low temperature zone 10 to 20 minutes, and the idle speed is high.

Thermostat is an automatic temperature regulating device, which usually includes a temperature sensing element. It turns on and off the flow of coolant by expansion or contraction, that is, it automatically adjusts the amount of water entering the radiator according to the temperature of coolant, and changes the circulation range of coolant to adjust the cooling capacity of the cooling system.

Symptoms of broken warm water tank: if there is no warm air, it is basically blocked; When the heater box leaks, there will always be fog on the front windshield that is difficult to remove, and there will be odor at the same time; Seriously, it will also cause antifreeze to flow into the car, and the engine is short of water and high temperature.