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Working Principle : 1. The water tank temperature sensor (actually a temperature control valve, not a water temperature gauge temperature sensor) detects that the temperature of the water tank exceeds the threshold (usually 95 degrees), the fan relay is activated; 2. The fan circuit is turned on through the fan relay, and the fan motor starts. 3. When the water tank temperature sensor detects that the temperature of the water tank is lower than the threshold, the fan relay is separated and the fan motor stops working. 4. The factor that affects the operation of the fan is the temperature of the water tank, which has no direct relationship with the water temperature of the engine. Function: .
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