• Thermostat Car Replacement- Work, Effects,Troubleshooting

    Thermostat Car Replacement- Work, Effects, Troubleshooting

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    The thermostat automatically adjusts the amount of water entering the radiator according to the temperature of the cooling water to ensure that the engine works in a suitable temperature range, which can save energy and the like. Because the engine is very fuel-efficient at low temperatures, and the damage to the car is large, including the accumulation of carbon deposits and a series of problems.

    Car thermostat interpretation valve control engine coolant flow path to save energy consumption type wax thermostat

    table of Contents

    1 Explanation
    2 role
    3 Working principle
    4 check
    5 failure phenomenon
    6 Troubleshooting

    •  Explanation

    A car thermostat is a valve that controls the flow path of the engine coolant.

    • Function

    The thermostat must be in good working condition, otherwise,e it will seriously affect the normal operation of the engine. If the thermostat is turned on (here, the main valve of the thermostat) is too late or even unable to open, it will cause the engine to overheat; if it is turned on too early, the engine warm-up time will be prolonged and the engine temperature will be too low.

    • Working principle

    Thermostat (A Thermostat) is a thermostat that usually contains a temperature sensing component that opens or closes the flow of coolant by expansion or contraction, that is, automatically adjusts the amount of water entering the radiator according to the temperature of the cooling liquid. , change the circulation range of the coolant to adjust the cooling capacity of the cooling system.
    The thermostat currently used is mainly a wax thermostat, which controls the circulation of the coolant by the principle of thermal expansion and contraction of the paraffin inside. When the cooling temperature is lower than the specified value, the refined paraffin in the temperature sensing body of the thermostat is solid, and the thermostat valve closes the passage between the engine and the radiator under the action of the spring, and the coolant is returned to the engine through the water pump to perform the engine. Small loop. When the temperature of the coolant reaches the specified value, the paraffin begins to melt and gradually becomes liquid, and the volume increases and the rubber tube is pressed to shrink. When the rubber tube contracts, the push rod acts on the upward thrust, and the push rod has the valve. The downward thrust reverses the valve. At this time, the coolant passes through the radiator and the thermostat valve and then flows back to the engine through the pump to perform a large cycle. Most of the thermostats are arranged in the cylinder head water outlet pipe. This has the advantages of simple structure and easy discharge of air bubbles in the cooling system. The disadvantage is that the thermostat often opens and closes during operation, causing oscillation.
    When the engine operating temperature is low (below 70 °C), the thermostat automatically closes the passage to the radiator and opens the passage to the water pump. The cooling water flowing out of the water jacket directly enters the water pump through the hose and is pumped. The water jacket is circulated again. Since the cooling water does not dissipate heat through the radiator, the operating temperature of the engine can be rapidly increased. This circulation route is called a small cycle. When the engine operating temperature is high (above 80 °C), the thermostat automatically closes the passage to the water pump and opens the passage to the radiator. The cooling water flowing out of the water jacket is cooled by the radiator and then sent to the water by the water pump. The sleeve increases the cooling strength to prevent the engine from overheating. This cycle is called a large cycle. When the engine operating temperature is between 70 and 80 °C, large and small cycles exist simultaneously, that is, part of the cooling water performs a large cycle, and another part of the cooling water performs a small cycle.
    The function of the car thermostat is to be in a closed state before the temperature of the car has reached normal temperature. At this time, the coolant of the engine is returned to the engine through the water pump, and a small cycle inside the engine is performed to accelerate the engine. When it exceeds the normal temperature, it can be turned on, allowing the coolant to circulate through the entire tank radiator circuit for rapid heat dissipation.

    • Check

    Wax thermostats typically have a safe life of 50,000 km, so they are required to be replaced periodically according to their safe life. Thermostat inspection method In the temperature can be debugged constant temperature heating equipment to check the opening temperature of the main valve of the thermostat, full temperature and lift, one of which does not meet the standard value, the thermostat should be replaced. For example, the temperature regulator of the Santana JV engine has a main valve opening temperature of 87 ° C plus or minus 2 ° C, a full opening temperature of 102 ° C plus or minus 3 ° C, and a full opening lift > 7 mm.

    • Fault phenomenon

    Under normal circumstances, when the engine is a cold start, the working temperature is very low. In order to make the temperature rise faster, then the thermostat is controlled by the thermostat (the main valve of the thermostat is closed), so that the coolant is pumped by the liquid pump. The water pipe and the coolant do not flow through the radiator. At this time, it is a small cycle. When the temperature of the coolant reaches 87 degrees (the temperature of the thermostat is 87 degrees, the same as golf), the thermostat valve is opened. The coolant begins to flow through the radiator and the cooling system enters a large cycle. Generally speaking, about five minutes after the car is started, the coolant temperature can reach 85~105 degrees normal temperature. If it does not reach the normal working temperature for a long time, or the temperature rises more than 110 degrees, it should be suspected whether it is The thermostat has failed.

    • Troubleshooting

    A. The temperature of the coolant exceeds 110 degrees: stop the engine and open the engine compartment cover. Touch the water (liquid) pipe in the coolant radiator by hand. The pipe should be very hot. Then touch the radiator water (liquid) tube, it should also be very hot. If there is a large temperature difference between the upper and lower water pipes, it is determined that the thermostat is faulty.

    B. If the normal working temperature is not reached for a long time: stop and let the engine temperature drop to the same temperature as the temperature, then start the engine and watch the temperature of the instrument panel rise to 70 degrees (not to 80 degrees or more). The engine compartment cover, touch the upper and lower water (liquid) pipes on the radiator by hand. If there is no temperature difference, it is determined that the thermostat is faulty.

    c. Using the infrared thermometer near the thermostat: detection method: using the infrared thermometer to aim the thermostat housing, test the temperature change of the water inlet and outlet of the thermostat, you can judge whether the thermostat is open, the engine When starting, the inlet temperature will increase. At this time, the thermostat is turned off. When the water temperature is expressed to 70 degrees, the temperature of the test outlet will suddenly increase. At this time, the temperature of the water temperature gauge should be above 80 degrees, indicating that the thermostat is turned on. Working normally. If the temperature does not change, the thermostat is not working properly and needs to be replaced. (Recommended for safety, do not use your hands to sense temperature changes)


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