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.
2004 GMC Jimmy (CANADA) V6-4.3LFACTORY OEM SERVICE PROCEDURE
Coolant Temperature Sensor/Switch (For Computer): Service and Repair
ENGINE COOLANT TEMPERATURE (ECT) SENSOR REPLACEMENT
REMOVAL PROCEDURE
NOTE: 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. Loosen the wing nuts on the air cleaner cover and air cleaner outlet duct.
3. Move the air intake assembly aside.
4. Drain the cooling system below the level of the engine coolant temperature (ECT) sensor.
5. Disconnect the ECT sensor harness connector.
6. Remove the ECT sensor.
INSTALLATION PROCEDURE
NOTE:
- Refer to Component Fastener Tightening Notice in Service Precautions.
- Use care when handling the coolant sensor. Damage to the coolant sensor will affect the operation of the fuel control system.
1. Coat the threads (only) with GM P/N 12346004 sealer or equivalent.
2. Install the ECT sensor in the engine.
Tighten
Tighten the sensor to 20 N.m (15 lb ft).
3. Connect the ECT sensor harness connector.
4. Refill the cooling system.
5. Install the air cleaner outlet duct assembly and tighten the wing nuts.
6. Connect the negative battery cable.
REMOVAL PROCEDURE
NOTE: 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. Loosen the wing nuts on the air cleaner cover and air cleaner outlet duct.
3. Move the air intake assembly aside.
4. Drain the cooling system below the level of the engine coolant temperature (ECT) sensor.
5. Disconnect the ECT sensor harness connector.
6. Remove the ECT sensor.
INSTALLATION PROCEDURE
NOTE:
- Refer to Component Fastener Tightening Notice in Service Precautions.
- Use care when handling the coolant sensor. Damage to the coolant sensor will affect the operation of the fuel control system.
1. Coat the threads (only) with GM P/N 12346004 sealer or equivalent.
2. Install the ECT sensor in the engine.
Tighten
Tighten the sensor to 20 N.m (15 lb ft).
3. Connect the ECT sensor harness connector.
4. Refill the cooling system.
5. Install the air cleaner outlet duct assembly and tighten the wing nuts.
6. Connect the negative battery cable.
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.
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