|Drop sensor in boiling water
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.
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.