Order of execution
1. If at a coolant temperature of 93-98°C the electric fan does not turn on, then it is most likely that the electric fan switch-on sensor has failed. To check the sensor, you need to disconnect the wires from it and close them directly, the fan should turn on even when the ignition is off. This indicates that the sensor is defective and needs to be replaced.
2. Before replacing the sensor, disconnect the wire from «negative» battery terminals. Drain coolant (see paragraphs. 1–3 subsections 4.1). Unscrew the sensor (16) (see fig. Cooling system of the four-cylinder engine) or (19) (see fig. Cooling system of the five-cylinder engine) from the radiator by disconnecting the wires from it. Remove gasket. Install the sensor in the reverse order, while replacing the gasket.
3. To check the removed sensor, you need to connect a battery and a 12 V lamp to it in series with the sensor. Immerse the threaded part of the sensor in water and heat it up. The sensor should turn on the lamp at 93–98°C. Then let the water cool down. At 88–93°C, the sensor should open the circuit and the lamp will go out. If the sensor response temperatures are not within the specified limits, then it is defective and must be replaced.
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