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 MANUALSCHEVROLET1999LUMINA V6-3.8L VIN KREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSCOOLANT TEMPERATURE SENSOR/SWITCH (FOR COMPUTER)SERVICE AND REPAIR
1999 Chevrolet Lumina V6-3.8L VIN K
Coolant Temperature Sensor/Switch (For Computer): Service and Repair
1999 Chevrolet Lumina V6-3.8L VIN KSECTION Service and Repair
ECT Sensor Replacement
REMOVAL PROCEDURE
IMPORTANT: Care must be taken when handling engine coolant temperature sensor. Damage to the engine coolant temperature sensor will affect proper operation of the fuel injection system.
CAUTION: Refer to Battery Disconnect Caution in Service Precautions.
1. Disconnect the negative battery cable.
2. Drain the radiator coolant. Refer to Draining and Filling Cooling System in engine cooling.
3. Disconnect the ECT sensor electrical connector.
4. Using a 19 mm deep well socket and an extension remove the ECT sensor.
INSTALLATION PROCEDURE
NOTICE: Refer to Fastener Notice in Service Precautions.
IMPORTANT: Care must be taken when handling engine coolant temperature sensor. Damage to the engine coolant temperature sensor will affect proper operation of the fuel injection system.
1. Hand start the ECT Sensor into the engine.
Tighten
Tighten the ECT Sensor to 30 N.m (22 lb ft).
2. Connect the ECT sensor electrical connector.
3. Refill the radiator with coolant. Refer to Draining and Filling Cooling System in engine cooling.
4. Connect the negative battery cable.
5. Start the engine and check for leaks.
6. Check the coolant level.
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.