1. Drain the engine coolant. Refer to Cooling System Draining and Filling .
2. Remove the air cleaner resonator outlet duct replacement Air Cleaner Resonator Outlet Duct Replacement .



3. Squeeze the plastic retainer release tabs.



4. Pull the hose connection apart.



5. Raise the vehicle. Refer to Lifting and Jacking the Vehicle .
6. Remove the right assist step if necessary. Refer to Assist Step Replacement .
7. Remove the front wheelhouse liner if necessary. Refer to Wheelhouse Panel Replacement .
8. Remove the auxiliary heater tubes connector nuts (2) from the intermediate connection point.



9. Remove the auxiliary heater tubes clip push pins (1) from vehicle frame locations.
10. Remove the auxiliary heater tubes (2) from vehicle.



11. Remove auxiliary heater tubes clip retaining push pin/bolt (1) if necessary.
12. Use a flat blade release tool to open retaining clips (2).
13. Remove auxiliary heater tubes (3) from retaining clips.

Important: The replacement A/C and heater pipes are shipped in front and rear sections.

1. Install the auxiliary heater tubes (3) to the retaining clips (2).
2. Install the auxiliary heater tubes (3) to the vehicle.



3. Install the auxiliary heater tubes clip push pins (1) to vehicle frame locations.

Notice: Refer to Fastener Notice in the Preface section.





Important: Use a adjustable wrench or equivalent holding tool at tube connections to prevent twisting.

Important: Mandatory torque sequence required for proper connections.

4. Install the auxiliary heater tube connection nuts (2) to the intermediate connection point.

Tighten
Tighten the nuts to 16 N·m (12 lb ft).





Important: Firmly push the quick connect onto the main heater hose connection until you here an audible click.

5. Install the auxiliary heater tubes (1) to the main heater hose connections.
6. Install the front wheelhouse liner if necessary. Refer to Wheelhouse Panel Replacement .
7. Install the right assist step if necessary. Refer to Assist Step Replacement .
8. Lower the vehicle.
9. Fill the engine coolant. Refer to Cooling System Draining and Filling .