Radiator Outlet Hose Replacement 4.8L, 5.3L, and 6.0L Engines

1. Drain the cooling system. Refer to Cooling System Draining and Filling .
2. Loosen the air cleaner outlet duct clamps at the following locations:

•	Throttle body

•	Mass airflow/intake air temperature (MAF/IAT) sensor

3. Remove the air cleaner outlet duct.



4. Reposition the outlet hose clamp from the water pump.
5. Remove the outlet hose from the water pump.



6. Reposition the outlet hose clamp from the radiator.
7. Remove the outlet hose from the radiator.

1. Install the outlet hose to the radiator.
2. Reposition the outlet hose clamp to the radiator.



3. Install the outlet hose to the water pump.
4. Reposition the outlet hose clamp to the water pump.




Important: Align the arrow at the throttle body end of the duct with the throttle body attaching stud.

5. Install the air cleaner outlet duct.
6. Install the radiator inlet hose clip to the outlet duct.

Notice: Refer to Fastener Notice in the Preface section.

7. Tighten the air cleaner outlet duct clamps at the following locations:

•	Throttle body

•	MAF/IAT sensor

Tighten
Tighten the air cleaner outlet duct clamp screws to 7 N·m (62 lb in).

8. Fill the cooling system. Refer to Cooling System Draining and Filling .

Radiator Outlet Hose Replacement Utility 8.1L Engine

1. Drain the cooling system. Refer to.
2. Remove the heater and surge tank hoses from the mounting clip.



3. Squeeze the plastic retainer release tabs.



4. Pull the connection apart.



5. Reposition the surge tank outlet hose clamp at the surge tank.
6. Remove the surge tank outlet hose (2) from the surge tank.



7. Remove the radiator outlet hose from the radiator. Refer to .



8. Reposition the outlet hose clamp the water pump.
9. Remove the outlet hose from the water pump.

1. Install the outlet hose to the water pump.
2. Position the outlet hose clamp to the water pump.



3. Install the surge tank outlet hose (2) from the surge tank.
4. Position the surge tank outlet hose clamp to the surge tank.



5. Install the radiator outlet hose to the radiator. Refer to .



6. Connect the heater and surge tank hoses to the heater core.

Important: Firmly push the quick connect onto the heater core pipe until you hear an audible click.

7. Pull the heater outlet hose to ensure the connection.
8. Install the heater and surge tank hoses to the mounting clip.
9. Fill the cooling system. Refer to.

Radiator Outlet Hose Replacement Avalanche/XLT 8.1L

Tools Required

J 43181 Quick Connect Connector Removal Tool

Important: Most truck models use a spring-type hose clamp at the hose connections. When using this type of clamp, install the radiator hoses on dry, non-painted surfaces in order to ensure proper sealing. Reusing the spring-type clamps on aftermarket hoses is not recommended.

1. Drain the cooling system. Refer to Cooling System Draining and Filling .
2. Remove the radiator outlet hose from the radiator. Refer to Radiator Hose Quick Connect Fitting .



3. Using the J 43181 disconnect the heater hoses from the heater core outlet.

3.1.	Install the J 43181 to the heater core pipe.

3.2.	Close the tool around the heater core pipe.

3.3.	Firmly pull the tool into the quick connect end of the heater hose.

3.4.	Firmly grasp the heater hose. Pull the heater hose forward in order to disengage the hose from the heater core.




4. Reposition the surge tank outlet hose clamp at the surge tank.
5. Remove the surge tank outlet hose (2) from the surge tank.



6. Reposition the outlet hose clamp the water pump.
7. Remove the outlet hose from the water pump.

1. Install the outlet hose to the water pump.
2. Position the outlet hose clamp to the water pump.



3. Install the surge tank outlet hose (2) from the surge tank.
4. Position the surge tank outlet hose clamp to the surge tank.



5. Connect the heater and surge tank hoses to the heater core.

Firmly push the quick connect onto the heater core pipe until you hear an audible click.




6. Install the radiator outlet hose to the radiator. Refer to Radiator Hose Quick Connect Fitting .
7. Fill the cooling system. Refer to Cooling System Draining and Filling .