Remove the thermostat from the engine. You will need a thermometer or some other device to read water temp. hang the thermostat in a pot (Placing the flange at water level) and place on the stove or some heating device. bring the water to the boil while watching the thermostat. As the water temp approaches 80-85c you will see the center of the thermo start to open. As the water approaches the boil thye thermo should be fully open. Check you readings (start to open and full open) with the specs stamped into the body of the thermostat. If they are the same the unit is ok. If it opens too hot or dosen't fully open buy a new one . If It is fully open when cold buy a new one.
SOURCE: need to check the thermostat on 1994 dodge caravan
Follow the upper radiator hose from the radiator to the engine, where the hose ends (Thermostat Housing) . The thermostat is under the housing,
SOURCE: overheating 1987 dodge caravan le
The only thing i could figure it was after checking the "easy" things was the head gasket. tore it down this morning and sure enough that was the problem. now that i have it a part i am going to do a complete rebuild on it, then it will last me for a while longer and i won't have to worry to much about it.
thanks
jen
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