Honda 8-25036-979-0 Sensor, Water Temperature

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To check the coolant temperature gauge, see if the fuses are blown. In case the needle reads "hot" with a cold engine, take off the wire going to the coolant temperature sender. If it falls, replace the sender unit. Otherwise, there is something wrong with either the wire or gauge itself. Different models of engines have different places where senders are fixed. Again, if the engine has warmed up and the gauge does not respond, ground that wire to test it further. Replace this sender if "Hot" is shown by the instrument cluster. In case it does not indicate overheating; an open circuit may be present or a defective gauge can be observed. Check resistance of this sender by heating it in water. Replace this item when necessary.

Check the resistance value of the Engine Coolant Temperature (ECT) Sensor while it is completely cold and compare the indicated resistance to the value specified in the accompanying chart. Then start the engine, warm it up until it reaches operating temperature, note the indicated resistance of the sensor as the coolant warms up and compare your measurements to the values specified in the accompanying chart.