Removal Procedure

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2003 GMC Yukon XL, 2003 GMC Yukon, 2003 Chevrolet Tahoe, 2003 Chevrolet Suburban, and 2003 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

Drain the cooling system/engine block. Refer to DRAINING AND FILLING COOLING SYSTEM .
Raise and suitably support the vehicle. Refer to LIFTING AND JACKING THE VEHICLE in General Information.
Remove the oil pan skid plate bolts and plate.

Fig 1: Removing Oil Pan Skid Plate Bolts And Plate
Courtesy of GENERAL MOTORS CORP.
Disconnect the coolant heater electrical connector.

Fig 2: Disconnecting Coolant Heater Electrical Connector
Courtesy of GENERAL MOTORS CORP.
Remove the coolant heater from the engine block.

Fig 3: Removing Coolant Heater From Engine Block
Courtesy of GENERAL MOTORS CORP.