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 MANUALSCHEVROLET1999ASTRO VAN 2WD V6-4.3L VIN WREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSCOOLANT TEMPERATURE SENSOR/SWITCH (FOR COMPUTER)SERVICE AND REPAIR
1999 Chevrolet Astro Van 2WD V6-4.3L VIN W
Coolant Temperature Sensor/Switch (For Computer): Service and Repair
1999 Chevrolet Astro Van 2WD V6-4.3L VIN WSECTION Service and Repair
REMOVAL PROCEDURE
NOTE: Use care when handling the coolant sensor. Damage to the coolant sensor will affect the operation of the fuel control system.
CAUTION: Refer to Battery Disconnect Caution in Service Precautions.
1. Disconnect the negative battery cable.
2. Remove air cleaner assembly.
CAUTION: To avoid being burned, do not remove the radiator cap or surge tank cap while the engine is hot. The cooling system will release scalding fluid and steam under pressure it radiator cap or surge tank cap is removed while the engine and radiator are still hot.
3. Relieve the coolant pressure.
4. Drain the cooling system below the level of the sensor. Refer to Draining and Filling Cooling System in Engine Cooling.
5. Remove the upper radiator hose from the intake manifold by loosening the radiator hose clamp.
6. Disconnect the ECT sensor harness connector.
7. Remove the ECT sensor.
INSTALLATION PROCEDURE
1. Coat the ECT threads (only) with sealer P/N 9985253 or equivalent.
NOTE: Refer to Component Tightening Notice in Service Precautions.
2. Install the ECT sensor.
Tighten
Tighten the sensor to 20 N.m (15 lb ft).
3. Connect the ECT sensor harness connector.
4. Connect the upper radiator hose.
5. Refill the cooling system. Refer to Draining and Filling Cooling System in Engine Cooling.
6. Install the air cleaner assembly.
7. Connect the negative battery cable.
NOTE: Use care when handling the coolant sensor. Damage to the coolant sensor will affect the operation of the fuel control system.
CAUTION: Refer to Battery Disconnect Caution in Service Precautions.
1. Disconnect the negative battery cable.
2. Remove air cleaner assembly.
CAUTION: To avoid being burned, do not remove the radiator cap or surge tank cap while the engine is hot. The cooling system will release scalding fluid and steam under pressure it radiator cap or surge tank cap is removed while the engine and radiator are still hot.
3. Relieve the coolant pressure.
4. Drain the cooling system below the level of the sensor. Refer to Draining and Filling Cooling System in Engine Cooling.
5. Remove the upper radiator hose from the intake manifold by loosening the radiator hose clamp.
6. Disconnect the ECT sensor harness connector.
7. Remove the ECT sensor.
INSTALLATION PROCEDURE
1. Coat the ECT threads (only) with sealer P/N 9985253 or equivalent.
NOTE: Refer to Component Tightening Notice in Service Precautions.
2. Install the ECT sensor.
Tighten
Tighten the sensor to 20 N.m (15 lb ft).
3. Connect the ECT sensor harness connector.
4. Connect the upper radiator hose.
5. Refill the cooling system. Refer to Draining and Filling Cooling System in Engine Cooling.
6. Install the air cleaner assembly.
7. Connect the negative battery cable.
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.