The factors that may lead to a decrease in the water level of the car radiator are:

1. Evaporation: During normal use, the water in the car's radiator gradually evaporates. Therefore, keep in mind to check the water level regularly and add water if necessary. 2. Leakage: A leak in the cooling system can cause the water level of the radiator to drop. If you notice a water leak near your radiator, car, or undercarriage, it's best to have it serviced and repaired right away. 3. Blockage: Condensation or blockage in the pipes or filters can restrict the flow of water and reduce the water level of the radiator. If there is a blockage, it is better to service the radiator and clean the pipes. 4. Water pump failure: If the water pump fails or malfunctions, the water flow will not reach the car's radiator completely and can lead to a decrease in the water level. In this case, you need to repair or replace the water pump. 5. Failure of the thermostat: Improper operation of the thermostat can increase the temperature of the engine and decrease the water level of the radiator. If the thermostat is broken, it is better to repair or replace it.

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