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The thermostat or the fan relay for the radiator fan. If the temperature gauge shows the engine to be hot the fan should be on. If the fan isn't on you can check it by removing the electrical connection to the temperature sensor. If the fan is all right it will come on by default when the wiring connector is removed. Usually it is the thermostat which needs to be replaced when the engine is overheating. If the top hose going to the radiator isn't hot when the temperature gauge shows the engine to be hot the thermostat is stuck shut and should be replaced.

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Q: How can you tell which component is badthermastat or relay switch for a 1992 ford escort lx?
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