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.
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HOMESERVICE MANUALSCHEVROLET2002AVALANCHE 2500 4WD V8-8.1L VIN GREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSCOOLANT TEMPERATURE SENSOR/SWITCH (FOR COMPUTER)SERVICE AND REPAIR
2002 Chevrolet Avalanche 2500 4WD V8-8.1L VIN G
Coolant Temperature Sensor/Switch (For Computer): Service and Repair
2002 Chevrolet Avalanche 2500 4WD V8-8.1L VIN GSECTION 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. Drain the cooling system below the level of the ECT sensor. Refer to Draining and Filling Cooling System in Cooling System.
3. Disconnect the ECT electrical connector (2).
4. Remove the ECT electrical connector from the bracket (1).
5. Remove the ECT sensor (3).
INSTALLATION PROCEDURE
1. Coat the threads with sealer P/N 9985253 or equivalent.
NOTE: Refer to Component Fastener Tightening Notice in Service Precautions.
2. Install the ECT sensor (3)
Tighten
Tighten the ECT sensor to 20 N.m (15 lb ft).
3. Connect the ECT electrical connector to the bracket (1).
4. Connect the ECT harness connector (2) to the ECT sensor (3).
5. Refill the cooling system. Refer to Draining and Filling Cooling System in Cooling System.
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. Drain the cooling system below the level of the ECT sensor. Refer to Draining and Filling Cooling System in Cooling System.
3. Disconnect the ECT electrical connector (2).
4. Remove the ECT electrical connector from the bracket (1).
5. Remove the ECT sensor (3).
INSTALLATION PROCEDURE
1. Coat the threads with sealer P/N 9985253 or equivalent.
NOTE: Refer to Component Fastener Tightening Notice in Service Precautions.
2. Install the ECT sensor (3)
Tighten
Tighten the ECT sensor to 20 N.m (15 lb ft).
3. Connect the ECT electrical connector to the bracket (1).
4. Connect the ECT harness connector (2) to the ECT sensor (3).
5. Refill the cooling system. Refer to Draining and Filling Cooling System in Cooling System.
RENDER: 1.0x
NO RELATED
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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.