- Drain the cooling system to a level below the ECT sensor.
- Unplug the harness connector from the ECT sensor.
- Remove the ECT sensor from the engine.
Installation is the reverse of removal. If reusing the old sensor, coat the threads with GM sealant 12346004 or equivalent. New sensors are already coated; additional sealant is not needed. Tighten the sensor to 15 ft. lbs. (20 Nm).