Heater Hoses Replacement 4.8L, 5.3L, 6.0L

Tools Required

J 43181 Quick Connect Connector Removal Tool

1. Drain the cooling system. Refer to Cooling System Draining and Filling .
2. Remove the air intake tube. Refer to Air Cleaner Assembly Replacement in Engine Controls-4.8L, 5.3L, 6.0L.
3. Remove the heater and surge tank hoses from the mounting clip.



4. Using J 43181 , disconnect the heater and surge tank hoses from the heater core inlet and the outlet.

•	Install J 43181 to the heater core pipes.

•	Close the tool around the heater core pipes.

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

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




5. Remove the inlet heater hose from the water pump.



6. Remove the inlet heater hose.

1. Install the inlet heater hose.



2. Install the inlet heater hose to the water pump.



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

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

4. Install the heater hoses to the mounting clip.
5. Install the air intake tube. Refer to Air Cleaner Assembly Replacement in Engine Controls-4.8L, 5.3L, 6.0L.
6. Fill the cooling system. Refer to Cooling System Draining and Filling .
7. Inspect the cooling system for leaks. Refer to Leak Testing .

Heater Hoses Replacement 4.3L

Tools Required

J 43181 Quick Connect Connector Removal Tool

1. Drain the cooling system. Refer to Cooling System Draining and Filling .
2. Remove the air intake tube. Refer to Air Cleaner Assembly Replacement in Engine Controls-4.3L.



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

•	Install the J 43181 to the heater core pipes.

•	Close the tool around the heater core pipes.

•	Firmly pull the tool into the quick connect end of the heater hoses.

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




4. Remove the inlet heater hose from the engine.



5. Remove the outlet heater hose mounting bolt.
6. Remove the outlet heater hose from the water pump.
7. Remove the heater hoses.

1. Install the heater hoses.



2. Install the outlet heater hose to the engine water pump

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

3. Install the heater hose mounting bolt.

Tighten
Tighten the heater hose mounting bolt to 25 N·m (18 lb ft).




4. Install the inlet heater hose to the engine



5. Connect the heater hoses to the heater core.

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

6. Install the air intake tube. Refer to Air Cleaner Assembly Replacement in Engine Controls-4.3L
7. Fill the cooling system. Refer to Cooling System Draining and Filling .
8. Inspect the cooling system for leaks. Refer to Leak Testing .