testing the hot lamp and sensor
the hot lamp can be tested by unpluging the lead from the sensor located on the head/jug and grounding it out to make the lamp come on.
the sensor can be tested in a pan of hot water-with salt or antifreeze--needs to get to 220 degrees F. the sensor is normaly open from the lead terminal to the threads. At about 220 degrees it will close the contacts and ground the circuit to light the lamp.
the fan switch is a normaly OPEN switch that will close at 180-190 degrees F--different machines and years have different values--none the less the fan comes on LONG before the HOT LAMP.
one more thing to check is that the water is indeed moving in the radiator cap areaa after warm up--past posts points at water pump only--
I would add the thermostat if no water movment is found.
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