Since water cooled engines can overheat due to air pockets at the thermostat, you want to know before the engine heat causes boiling of the coolant. First: Always know if your thermostat has a small bleed thru-hole in it. Second: Hook up a gauge to monitor temperature. The wet bulb of the sender should be located in an area sure to always have the presence of coolant, but in an area that is the most hot. You can use a thermal imaging gun to know for sure, but a safe bet is probably the entrance to your water pump (especially on V-8 and V-6 engines). Third: If you do not want to run your electric fans continuously, locate the thermal switch for the fan relay directly on or near the radiator. If it is a wet blub sender, TIG weld or braze a boss right on the side of the radiator at the thickest wall. If it is a dry switch do not drill into the radiator to mount it, but rather mount the switch to a small metal plate and then nylon tie that metal plate to the front of the radiator. A shroud around the sensor is probably a good idea.
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