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To check the sending unit for the temperature gauge in a 2004 Saturn Ion 3, first, locate the coolant temperature sensor, typically found near the thermostat housing. Disconnect the electrical connector from the sensor and use a multimeter to measure the resistance across the terminals; compare this reading to the specifications in your service manual. If the resistance values are outside the specified range, the sending unit may need to be replaced. Additionally, you can check for any coolant leaks or issues with the wiring that could affect gauge performance.

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2mo ago

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