It is abnormal for the water temperature of the 15-model Sagitar to drop when the heater is turned on. The reason why the car's water temperature rises slowly is usually that the thermostat cannot be turned off due to damage to the thermostat, or the cooling fan is malfunctioning and running continuously. When the thermostat valve fails to close, the coolant is always circulating, and the car's water temperature will drop quickly. If the cooling fan fails and keeps spinning, it will also cause the car's water temperature to be low.
The reason why the car water temperature rises slowly is usually that the thermostat is damaged and cannot be turned off, or the cooling fan is malfunctioning and running continuously. When the thermostat valve fails to close, the coolant is always circulating, and the car's water temperature will drop quickly. If the cooling fan fails and keeps spinning, it will also cause the car's water temperature to be low.
The way to deal with low water temperature in a car is to first check whether there are problems with the cooling device, such as whether the blinds are blocked, whether the fan blades are deformed, whether the water temperature sensor and circuit are short-circuited; you can dismantle and inspect the thermostat and put it in place. Put the thermostat into water of different temperatures and observe the opening status of the thermostat. If it cannot open or close normally, replace the thermostat.
The thermostat is a component that automatically acts as a valve according to the engine water temperature. It is generally installed at the outlet of the radiator and the inlet of the water pump to control the circulation of coolant in the cooling system to achieve a large circulation. Still a small cycle. The general circulation refers to the path the coolant flows when the thermostat is opened. The small circulation refers to the cooling flow path when the thermostat is not open. If the water temperature is low, it may be that the thermostat has been left open and the coolant has been circulating, causing the water temperature to drop.
The water temperature in the car is low and the cooling fan is malfunctioning. For electronic fans, circuit failure causes the electronic fan to rotate constantly; for silicone oil fans, damage to the silicone oil clutch can also cause the fan to rotate frequently. These failures will cause the water temperature to be low.
The temperature of the car is not lower, the better, nor is it higher, it needs to be controlled within a certain range. The normal temperature is 90°C, located in the middle of the water temperature meter. The antifreeze temperature rises rapidly after the vehicle is started. After the pointer reaches the middle position, the heat exchange balance antifreeze temperature no longer rises. It is best to start when the temperature reaches the middle position. This is one of the reasons why the vehicle must be warmed up before starting.