Auxiliary Heater Core Replacement Tahoe/Yukon

1. Remove the auxiliary HVAC module (4) from the vehicle. Refer to Auxiliary HVAC Module Replacement



2. Remove the air temperature actuator (1) from the auxiliary HVAC module.



3. Remove the heater core cover (1) from the auxiliary HVAC module.



4. Remove the heater core (1) from the auxiliary HVAC module.

1. Install the heater core (1) to the auxiliary HVAC module.



2. Install the heater core cover (1) to the auxiliary HVAC module.



3. Install the air temperature actuator (1) to the auxiliary HVAC module.



4. Install the auxiliary HVAC module assembly  (4) to the vehicle. Refer to Auxiliary HVAC Module Replacement

Auxiliary Heater Core Replacement Suburban/Yukon XL

1. Remove the auxiliary HVAC module (3) from the vehicle. Refer to Auxiliary HVAC Module Replacement .



2. Remove the air temperature actuator (1) from the auxiliary HVAC module.



3. Remove the stud on the underside of the auxiliary HVAC module between the heater core inlet and outlet pipes.
4. Carefully separate the heater core pipe gasket from the module case and remove the heater core pipe retainer.
5. Remove the auxiliary HVAC module lower cover.



6. Remove the heater core clamp.
7. Remove the heater core from the auxiliary HVAC module.

1. Install the heater core to the auxiliary HVAC module.
2. Install the heater core clamp.



3. Install the auxiliary HVAC module lower cover.
4. Install the heater core pipe retainer and gasket.
5. Install the stud between the heater core inlet and outlet on the underside of the rear HVAC module.



6. Install the air temperature actuator (1) to the auxiliary HVAC module.



7. Install the auxiliary HVAC module assembly  (3) to the vehicle.