What is the role of a car thermostat
Car thermostats play a vital role in the car air conditioning system . It controls the switching state of the compressor by sensing the surface temperature of the evaporator, the internal temperature of the carriage and the external ambient temperature to ensure that the temperature in the car is always kept within a comfortable range. Specifically, the thermostat works as follows:
: The thermostat senses the temperature of the evaporator surface. When the temperature in the car reaches the preset value, the thermostat contact is closed, the clutch circuit is connected, and the compressor is started to provide cold air for passengers; When the temperature drops below the set value, the contact is disconnected and the compressor stops working to avoid excessive cooling causing the evaporator to freeze .
Safety setting : The thermostat also has a safety setting, which is the absolute off position. Even when the compressor is not working, the blower can still keep running to ensure that the air in the car .
prevent frosting of evaporator : By precise control of temperature, thermostat can effectively prevent frosting of evaporator, ensure the normal operation of air conditioning system and the balance of temperature in the car .
In addition, car thermostats have other important roles:
Improved ride comfort : By automatically adjusting the temperature in the car, the thermostat ensures a comfortable ride experience in all conditions .
protect the equipment in the car : for some more sensitive electronic equipment, such as car recorder, navigator and sound system, stable temperature can reduce their loss rate, extend the service life .
Solutions for broken car thermostats :
Stop immediately : If the thermostat is found to be faulty, stop immediately and avoid continuing. The thermostat is responsible for regulating the flow of engine coolant to ensure that the engine works within the appropriate temperature range. If the thermostat is damaged, it may cause the engine temperature to be too high or too low, seriously affecting the engine performance and even shortening its service life .
Fault diagnosis : You can diagnose whether the thermostat is faulty by:
Abnormal coolant temperature : If the coolant temperature exceeds 110 degrees, check the temperature of the radiator water supply pipe and the radiator water pipe. If the temperature difference between the upper and lower water pipes is significant, it may indicate that the thermostat is faulty .
engine temperature not reach normal : if the engine fails to reach the normal operating temperature for a long time, stop the engine to let the temperature drop to stability, and then restart. When the temperature of the instrument panel reaches about 70 degrees, check the temperature of the radiator water pipe. If there is no obvious temperature difference, the thermostat may fail .
equipped with an infrared thermometer : Use an infrared thermometer to align the thermostat housing and observe the temperature changes at the inlet and outlet. When the engine starts, the intake temperature will rise and the thermostat should be turned off. When the temperature reaches about 70 ° C, the outlet temperature should suddenly rise. If the temperature does not change at this time, it indicates that the thermostat is working abnormally and needs to be replaced in time.
Change the thermostat :
Preparations : Turn off the engine, open the front cover and remove the negative battery wire and plastic sleeve outside the sync belt .
Removing the generator assembly : because the position of the generator affects the replacement of the thermostat, the motor assembly needs to be removed. In preparation for removing the water pipe .
Replacing the thermostat : After removing the downwater pipe, the thermostat itself can be seen. Remove the faulty thermostat and install a new one. After installation, apply sealant to the tap water to prevent water leakage. Install the removed water pipe, generator and timing plastic cover in place, connect the negative battery, add new antifreeze, and test on the car .
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