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Drop sensor in boiling water

Question : How do I test the radiator fan and sensor? There is a sensor at the side of the radiator with two wires connected to it. If I pull out the two wires and short them, will the fan start? What should be the trip temperature of the sensor? I assume that it is normally open when the temperature is below the trip point. So if I drop it in boiling water, should it close?

The temperature will rise to the red zone when the car is stationary and drop immediately once the car is moving.

Answer : The sensor only closes a set of contacts and should trigger at 90 oC. You can take out the sensor and after turning on the ignition, suspend the sensor in boiling water. The fan should start working. If not, the sensor is faulty. I think the reason why the temperature is going so high is that the fan is not coming on or the switch is faulty. If you get that sorted out, I think the temperature will be stable.

 
   
 

Irritating sensor

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Drop sensor in boiling water

Check sensors

Testing lambda sensor

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ABS-olute non-sense

Sensor fault

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Faulty sensor

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02 sensor

Lambda symbol

Oxygen sensor

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