Removal Procedure

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Removing/Installing Coolant Heater Cord From Heater

Courtesy of GENERAL MOTORS CORP.

If equipped with a 4.2L engine, remove the PCM. Refer to Powertrain Control Module (PCM) Replacement in Engine Controls - 4.2L.
Remove the coolant heater cord from the engine harness bracket (1).
Remove the coolant heater cord from the coolant heater (2).

Fig 2: Disconnecting/Connecting Coolant Heater Electrical Connector

Courtesy of GENERAL MOTORS CORP.

If equipped with a 5.3L engine, disconnect the coolant heater cord from the coolant heater (1).
Remove the coolant heater cord clip from the engine harness.

Fig 3: Disconnecting/Connecting Coolant Heater Cord Retainers

Courtesy of GENERAL MOTORS CORP.

Disconnect the coolant heater cord retainers (1) from the battery cover.