Removal (4.2L)

WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. 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.
Install a 3/8" drive breaker bar onto the drive belt tensioner. See Fig 1. Turn breaker bar clockwise enough to relieve the tension on the drive belt. Remove drive belt. Release tension on drive belt tensioner.
Remove generator positive post cable nut. Remove A/C line bracket-to-engine lift hook bolt. Remove engine lift hook. Remove 3 generator mounting bolts. See Fig 2. Remove generator.
Disconnect ECT sensor harness connector. See Fig 3. ECT sensor is located on left front of engine, above thermostat housing. See Fig 4. Remove ECT sensor.

Fig 1: Identifying Drive Belt Routing & Drive Belt Tensioner

Courtesy of GENERAL MOTORS CORP.

Fig 2: Removing & Installing Generator

Courtesy of GENERAL MOTORS CORP.

Fig 3: Locating Engine Coolant Temperature Sensor Harness Connector

Courtesy of GENERAL MOTORS CORP.

Fig 4: Locating Engine Coolant Temperature Sensor

Courtesy of GENERAL MOTORS CORP.