Engine Coolant Temperature Sensor: Removal

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

Turn ignition off. Disconnect negative battery cable. Drain coolant below level of Engine Coolant Temperature (ECT) sensor into a suitable container. Disconnect ECT sensor harness connector.
On 4.8L, 5.3L and 6.0L models, ECT sensor is located on left side of engine, near front of exhaust manifold. See Fig 1.
On 8.1L models, ECT sensor is located on right side of engine, near middle of cylinder head. See Fig 2. On all models, remove ECT sensor.

Fig 1: Locating Idle Air Control Valve, EVAP Canister Purge Solenoid, Manifold Absolute Pressure Sensor, Engine Coolant Temperature Sensor & Throttle Position Sensor (4.8L, 5.3L & 6.0L)

Courtesy of GENERAL MOTORS CORP.

Fig 2: Locating Engine Coolant Temperature Sensor, Manifold Absolute Pressure Sensor & Throttle Actuator Control Motor (8.1L)

Courtesy of GENERAL MOTORS CORP.