Auxiliary Heater Pipe Replacement

Auxiliary Heater Pipe Replacement

Removal Procedure





1. Drain the cooling system. Refer to Cooling System Draining and Filling (Static Fill) Cooling System Draining and Filling (Static Fill).

2. Squeeze the plastic retainer tabs on the inlet hose.

Quick Connect Fittings:

3. Pull the connection apart.





4. Squeeze the plastic retainer tabs on the outlet hose.

Quick Connect Fittings:

5. Pull the connection apart.





6. Remove the auxiliary heater pipes (1, 2) from the heater inlet and outlet tees (3, 4) at the HVAC module.

7. Remove the vehicle right assist step. Refer to Assist Step Replacement (GMC Denali XL) Assist Step Replacement (Chevrolet HP2) Assist Step Replacement (Power BRS) Assist Step Replacement (Z71) .

Remove both of the right tires. Refer to Tire and Wheel Removal and Installation Removal and Replacement.

8. Remove the right rear wheelhouse panel. Refer to Rear Wheelhouse Panel Liner Replacement (RPO X88 Chevrolet, RPO O88 GMC) Rear Wheelhouse Panel Liner Replacement (RPO HP2) .

9. Remove the right front wheelhouse panel. Refer to Front Wheelhouse Liner Replacement - Right Side .





10. Remove the auxiliary heater pipes (2, 3) from the auxiliary heater core.





11. Remove the heater/A/C tubes retaining nut (4) from the stud (1) at the frame (6).

12. Remove the auxiliary heater pipes (2) from the clamps (5).

13. Remove the auxiliary heater pipes from the vehicle.

Installation Procedure

Note:
The replacement A/C and heater pipes are shipped in two sections and spliced together upon installation. Refer to Auxiliary Heater and Air Conditioning Pipe Repair Procedures.

1. Install the auxiliary heater pipes to the vehicle.





2. Install the auxiliary heater pipes (2) to the clamps (5).

Caution:
Refer to Fastener Caution Fastener Caution.

3. Install the heater/A/C tubes retaining nut (4) to the stud (1) at the frame (6) and tighten to 7 Nm (62 lb in).





4. Install the auxiliary heater pipes (2, 3) to the auxiliary heater core.

5. Install the right front wheelhouse panel. Refer to Front Wheelhouse Liner Replacement - Right Side .

6. Install the right rear wheelhouse panel. Refer to Rear Wheelhouse Panel Liner Replacement (RPO X88 Chevrolet, RPO O88 GMC) Rear Wheelhouse Panel Liner Replacement (RPO HP2) .

7. Install the vehicle right assist step. Refer to Assist Step Replacement (GMC Denali XL) Assist Step Replacement (Chevrolet HP2) Assist Step Replacement (Power BRS) Assist Step Replacement (Z71) .





8. Install the auxiliary heater pipes (1, 2) to the heater inlet and outlet tees (3, 4).





9. Connect the outlet heater hose to the heater core.

10. Connect the inlet heater hose to the heater core.

11. Fill the cooling system. Refer to Cooling System Draining and Filling (Static Fill) Cooling System Draining and Filling (Static Fill).