Nissan 22630-1B000 Engine Air Temperature Sensor

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The coolant temperature indicator system consists of a temperature gauge mounted in the instrument panel and a coolant temperature sending unit mounted on the engine. If an overheating indication occurs even when the engine is cold, check the wiring between the dash and the sending unit for a short circuit to ground. 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. If the sending unit must be replaced, unscrew it from the engine and quickly install the replacement. Use a conductive sealant on the threads (not Teflon tape) Make sure the engine is cool before removing the defective sending unit. There will be some coolant loss as the unit is removed, so be prepared to catch it. Check the coolant level after the replacement part has been installed.