Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2008 Pontiac G6 L4-2.4LFACTORY OEM SERVICE PROCEDURE
Coolant Temperature Sensor/Switch (For Computer): Service and Repair
Engine Coolant Temperature Sensor Replacement
Removal Procedure
1. Partially drain the cooling system. Refer to Cooling System Draining and Filling (LY7, LZ4, LZ9 Static Fill) Cooling System Draining and Filling (GE 47716 Fill) Cooling System Draining and Filling (LE5 Static Fill).
2. Disconnect the engine coolant temperature (ECT) sensor electrical connector (1).
3. Remove the ECT sensor.
Installation Procedure
Important: Use a tap in order to remove any sealant residue in the sensor hole in the thermostat housing. Clean any sealant residue from the old sensor (if reusing) and apply the room temperature vulcanizing (RTV) sealant to the threads.
1. Apply sealant to the threads of the ECT sensor. Refer to Sealers, Adhesives, and Lubricants.
Notice: Refer to Fastener Notice.
2. Install the ECT sensor.
Tighten the sensor to 20 N.m (15 lb ft).
3. Connect the ECT sensor electrical connector (1).
4. Fill the cooling system as needed. Refer to Cooling System Draining and Filling (LY7, LZ4, LZ9 Static Fill) Cooling System Draining and Filling (GE 47716 Fill) Cooling System Draining and Filling (LE5 Static Fill).
Factory Service Tools
Use the Manual With the Right Hardware
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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.