How to Change the Coolant Sensor in a 2006 Chevy Cobaltby Don Bowman
The Chevy Cobalt has three engine options: the 2.0-, 2.2- and the 2.4-liter. The 2.0- and 2.2-liter engines use the same sensor while the 2.4-liter engine is different. The 2.0-liter engine sensor is located on the top front of the engine. The 2.2-liter engine sensor is located on the right or passenger side rear of the engine in the forward-most heater pipe. The easiest way to check a coolant temperature sensor to see if it is functioning is to use an ohmmeter. Simply unplug it and check the resistance between the two terminals in the sensor with the engine cold. Record the results and start the engine and warm it up. Once the engine is warm shut it off and recheck the resistance between the two terminals in the sensor. It the readings have changed its good, and if the readings remain the same, its bad.
Lift the hood and locate the coolant temperature sensor. Make sure the engine is cold before removing the sensor. Unplug the sensor electrical connector.
Remove the sensor using the appropriate deep-well socket. Very little antifreeze will be lost due to the location of the sensor.
Wrap the threads of the new sensor with Teflon tape. Thread the new sensor in and tighten it to 89 inch-pounds of torque.
Plug in the electrical connector to the sensor. Rinse off the small amount of antifreeze lost during the replacement of the sensor.