C 1500 Yukon 2WD V8-5.3L VIN Z Flex Fuel (2003)
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.