Acura 37870-RTA-005 Engine Coolant Temperature Sensor (Denso)

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The temperature gauge operation depends on a sending unit mounted in the water passage/thermostat housing on the engine. If the temperature gauge reads HOT when the engine is cold, check the wiring between the temperature gauge and the sending unit for a short circuit (going to ground). If the engine is warm but the temperature gauge reads COLD, test the gauge by briefly grounding the wire to the sending unit while the ignition is in the On position and the is engine OFF. To test the sending unit, disconnect the electrical connector and attach an ohmmeter from the pin on top of the sender to an engine ground. Prepare the new sending unit for installation by applying a conductive sealant on the threads (not Teflon tape). Disconnect the electrical connector for the sending unit, unscrew the unit from the engine and quickly install the replacement. Reconnect the electrical connector and test the operation of the temperature gauge.