Pulled the sensor out, although it was at a level of coolant, it was constant on, so useless.

Jerry

Where is the heat sensor located in you car? It may have an air pocket around it, which would give erroneous readings. When one drains a car for such a repair, air gets into the system and needs to be bled out. If the senser is above the thermostat and the thermotat is closed, it may be sitting in air which is heated by the surounding metal. The flow of coolant also 'cools' the sensor so it reads the coolant temp, not the metal temp. When an engine boils and loes its coolant, the senser reads 'high' temperature and runs the fan. A dry engine would do the same.

 

 

don't ask us, check the fan switch for continuity (cold and hot - remove it and use a pot of boiling water to make it hot), and find out if the switch is "on" all of the time

If the heat got high enough to fry a switch like that, then I would worry that the engine was damaged, but if the engine is working fine, then I'd suspect the switch failed for another reason (water attacking it from outside, or something else).

Norm

Group, I replaced the heater valve and added water to the radiator, turned the car over to start, and notice the electric fan no runs all the time. The controller for the fan probably did get wet, the empty radiator could have raised the temp on the thermostat that works with the controller. Does anybody have a guess as to if the water did damage, or the thermostat overheated? Or, could be something else.

Thanks for your opinions.

Jerry