Chevrolet 12611420 Sensor, Engine Coolant Temperature

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The coolant temperature indicator system consists of a warning light or a temperature gauge on the dash and a coolant temperature sending unit mounted on the engine. On the models covered, the Engine Coolant Temperature (ECT) sensor is an information sensor for the Powertrain Control Module (PCM) and also functions as the coolant temperature sending unit for the temperature gauge.

The coolant temperature indicator system consists of a warning light or a temperature gauge on the dash and a coolant temperature sending unit mounted on the engine.

If there is an overheating indication, it is important to check the coolant level and ensure that all connectors in the wiring harness between the sending unit and the indicator light or gauge are securely connected.

Turn the ignition key to OFF. Drain the cooling system. It's not necessary to fully drain the coolant, but it must be drained to a level that's below the level of the ECT sensor. Disconnect the electrical connector from the ECT sensor, which is located at the right front (passenger's side) corner of the cylinder head on 2.0L supercharged engines, near the valve cover. On 2.2L and 2.4L engines, the sensor is located in the thermostat housing, between the two heater hose pipes. On 2008 and later 2.0L turbocharged engines, the sensor is located at the left rear of the cylinder head (driver's side). You may need to unbolt the under-hood fuse and relay center, moving it aside for access. Unscrew the ECT sensor and remove it. Wrap the threads of the ECT sensor with Teflon tape. Installation is the reverse of removal. Be sure to tighten the ECT sensor to the torque specifications. Refill the cooling system when you're done.

To remove the engine coolant temperature (ECT) sensor, start by removing the engine cover. If you choose not to drain the coolant, be prepared for some coolant to leak out when removing the sensor, so it's best to install the new sensor quickly. Disconnect the electrical connector from the ECT sensor, which is located at the front of the engine on the side of the engine block for 3.0L and 3.6L V6 models, and below the exhaust manifold towards the end of the engine for 2.4L four-cylinder models. Use a wrench to unscrew the ECT sensor, as most deep sockets won't fit over it. When installing the new ECT sensor, apply some sealant to the threads. Finally, reinstall the engine cover and refill the cooling system, or check the coolant level and add more if necessary if you didn't drain the coolant.

When the ignition switch is turned to START and the starter motor is turning, the indicator light should come on, indicating that the bulb is functioning properly.