Coolant Temperature Sensor/Switch (For Computer): Service and Repair

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Engine Coolant Temperature Sensor Replacement

Removal Procedure


Notice: Use care when handling the coolant sensor. Damage to the coolant sensor will affect the operation of the fuel control system.

1. Turn OFF the ignition.




2. Raise the vehicle. Refer to Vehicle Lifting.
3. Drain the cooling system below the level of the ECT sensor. Refer to Draining and Filling Cooling System (Static Fill) Draining and Filling Cooling System (Vac N Fill).
4. Lower the vehicle.
5. Disconnect the electrical connector from the engine coolant temperature (ECT) sensor.




6. Remove the ECT sensor.

Installation Procedure

Notice: Replacement components must be the correct part number for the application. Components requiring the use of the thread locking compound, lubricants, corrosion inhibitors, or sealants are identified in the service procedure. Some replacement components may come with these coatings already applied. Do not use these coatings on components unless specified. These coatings can affect the final torque, which may affect the operation of the component. Use the correct torque specification when installing components in order to avoid damage.

Notice: Use care when handling the coolant sensor. Damage to the coolant sensor will affect the operation of the fuel control system.

1. Coat the ECT sensor threads with sealer GM P/N 12346004 (Canadian P/N 10953480) or the equivalent.





Notice: Refer to Fastener Notice.

2. Install the ECT sensor.

Tighten the ECT sensor to 20 N.m (15 lb ft).




3. Connect the ECT sensor electrical connector.
4. Refill the engine coolant. Refer to Draining and Filling Cooling System (Static Fill) Draining and Filling Cooling System (Vac N Fill).
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.