Auxiliary Heater Core Replacement (Standard Wheelbase)

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2012 GMC Yukon XL, 2012 GMC Yukon, 2012 Chevrolet Tahoe, 2012 Chevrolet Suburban, and 2012 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Locating Auxiliary Heater Core

Courtesy of GENERAL MOTORS COMPANY

Callout	Component Name
Preliminary Procedure Remove the HVAC module - auxiliary. Refer to Auxiliary HVAC Module Removal and Installation (Standard Wheelbase) , Auxiliary HVAC Module Removal and Installation (Extended Wheelbase) . Disconnect any wiring connectors or harnesses from HVAC module.
1	HVAC Module Gasket
2	Auxiliary HVAC Module Lower Cover Bolt (Qty: 3) CAUTION: Refer to Fastener Caution . TIP: Remove any fastener clips that secure cover to module. Tighten 3 N.m (27 lb in)
3	Auxiliary HVAC Module Lower Cover
4	Separate the HVAC Module Case TIP: Remove any fastener clips that secure cover to module. Tighten 3 N.m (27 lb in)
5	Auxiliary HVAC Heater Core TIP: Ensure all seals and gaskets are in place upon installation.