What is a car thermostat cover
The thermostat cover of a car is a valve device that controls the flow path of the coolant. It automatically regulates the path of the coolant to the radiator or the engine through the temperature-sensing component to ensure that the engine operates within an appropriate temperature range.
Core function
The thermostat cover automatically opens or closes the coolant circulation path based on the coolant temperature. When the water temperature is low, it closes the passage to the radiator, allowing the coolant to circulate inside the engine to heat up quickly. When the water temperature reaches around 85℃, gradually open the channel to achieve wide-range circulation and maintain the optimal operating temperature of the engine.
Structural features
Paraffin material temperature sensing elements are usually adopted. At low temperatures, paraffin remains solid and closes the channel; at high temperatures, it melts and opens the channel. For some models, the thermostat cover is integrated into the thermostat assembly and balances the engine temperature by controlling the coolant flow.
The function of the car thermostat cover (i.e., the thermostat) is to automatically adjust the circulation path of the cooling system according to the temperature of the coolant, ensuring that the engine operates within the optimal temperature range. The specific functions are as follows
Temperature regulation
The heat dissipation intensity can be adjusted by controlling the flow of coolant to the radiator or by directly circulating it back to the engine. When the temperature is low, close the valve. The coolant only circulates briefly inside the engine, causing it to heat up quickly. After reaching the working temperature, open the valve to enter the large circulation of the radiator for heat dissipation.
Protect the engine
Prevent water temperature from being too high or too low
When the water temperature is low, reduce heat dissipation to prevent the engine from being too cold during cold starts.
When the water temperature is high, increase heat dissipation to prevent the engine from overheating.
Improve efficiency
Precise temperature control can optimize fuel economy and extend engine life, avoiding performance degradation and wear caused by overheating or overcooling.
If the thermostat is damaged, it will cause abnormal water temperature (such as normal idle speed but water temperature drops at high speed, high water temperature in the high-temperature zone, etc.), and it needs to be repaired in time.
A malfunction of the car's thermostat cover (i.e., the temperature controller) can lead to abnormal cooling system, mainly manifested as the following symptoms:
Abnormal electronic fan
Youdaoplaceholder0 fan not starting : When the coolant reaches the set temperature, the thermostat fails to trigger the electronic fan to work, resulting in insufficient heat dissipation.
Youdaoplaceholder0 Fan keeps running : When the coolant has not reached the required temperature, the thermostat mistakenly triggers the fan to keep running, depleting the battery power.
Engine overheating
Youdaoplaceholder0 Water temperature rise : The coolant cannot effectively dissipate heat, and the water temperature keeps rising, which may cause cylinder pulling, cylinder head deformation, or even engine stalling.
Youdaoplaceholder0 Power decline : High temperatures cause the engine's power output to weaken, and metallic knocking sounds may occur during acceleration.
Other abnormalities
Youdaoplaceholder0 constant water temperature warning light : The ECU cannot receive accurate temperature signals, triggering the protection mechanism to force heat dissipation.
Youdaoplaceholder0 Abnormal heat dissipation : Failure of the thermostat may cause blockage of the large circulation and abnormal display of the water temperature gauge (such as the water temperature gauge showing high temperature for a long time).
It is recommended to check the status of the temperature controller in a timely manner to avoid more serious malfunctions caused by heat dissipation issues.
The thermostat, also known as the temperature regulator, is a valve that controls the flow path of the coolant. As an automatic temperature control device, it usually contains a temperature-sensing component that turns on or off the flow of air, gas or liquid by expanding or contracting. Its function is based on the engine
The temperature of the cooling water is automatically adjusted to regulate the amount of water entering the radiator, changing the circulation range of the water to adjust the heat dissipation capacity of the cooling system and ensure that the engine operates within an appropriate temperature range.
As a core component of the internal combustion engine cooling system, the thermostat not only ensures the normal operation of the internal combustion engine but also has a significant impact on its fuel economy, emissions and other performance aspects. Its development has been highly valued by the automotive industry.
The thermostat automatically adjusts the amount of water entering the radiator based on the temperature of the cooling water, changing the circulation range of the water to regulate the heat dissipation capacity of the cooling system and ensure that the engine operates within an appropriate temperature range. The thermostat must be kept in good technical condition; otherwise, it will seriously affect the normal operation of the engine. If the main valve of the thermostat opens too late, it will cause the engine to overheat. If the main valve is opened too early, the preheating time of the engine will be prolonged, causing the engine temperature to be too low.
The thermostat must be kept in good technical condition; otherwise, it will seriously affect the normal operation of the engine. If the main valve of the thermostat opens too late, it will cause the engine to overheat. If the main valve is opened too early, the preheating time of the engine will be prolonged, causing the engine temperature to be too low. At this point, it can be determined whether the working condition of the thermostat is good: when the engine starts to run cold, if there is still cooling water flowing out from the water inlet pipe of the upper water chamber of the radiator, it indicates that the main valve of the thermostat cannot be closed. When the temperature of the engine cooling water exceeds 70℃ and there is no cooling water flowing out from the water inlet pipe of the upper water chamber of the radiator, it indicates that the main valve of the thermostat cannot open normally. At this time, repair is required.
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