K 1500 Yukon 4WD V8-5.3L VIN Z Flex Fuel (2003)
6. Remove the auxiliary heater pipes (1, 2) from the heater inlet and outlet tees (3, 4).
7. Remove both of the right tires.
8. Remove the right rear wheelhouse panel.
9. Remove the right front wheelhouse panel.
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
