Heater Inlet Hose Replacement Utility L18

1. Drain the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.
2. Remove the air intake tube.
3. Remove the heater and surge tank hoses from the mounting clip.



4. Squeeze the plastic retainer release tabs.



5. Pull the connection apart.



6. Remove the inlet heater hose (1) from the coolant outlet fitting.
7. Remove the inlet heater hose.

1. Install the inlet heater hose.



2. Install the inlet heater hose (1) to the coolant outlet fitting.



3. 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.

4. Install the heater and surge tank hoses to the mounting clip.
5. Install the air intake tube.
6. Fill the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.

Heater Inlet Hose Replacement Utility LR4, LM7, LQ4

1. Drain the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.
2. Remove the air intake tube.
3. Remove the heater and surge tank hoses from the mounting clip.



4. Squeeze the plastic retainer release tabs.



5. Pull the connection apart.



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



7. 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 hose to the heater core.

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

4. Install the heater and surge tank hoses to the mounting clip.
5. Install the air intake tube.
6. Fill the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.

Heater Inlet Hose Replacement Avalanche/XLT L18

Tools Required

J 43181 Quick Connect Connector Removal Tool

1. Drain the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.
2. Remove the air intake tube.
3. Remove the heater and surge tank hose from the mounting clip.



4. Using the J 43181 disconnect the heater hose from the heater core inlet.

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

4.2.	Close the tool around the heater core pipe.

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

4.4.	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 (1) from the engine coolant inlet fitting.
6. Remove the inlet heater hose.

1. Install the inlet heater hose.



2. Install the inlet heater hose (1) to the engine coolant inlet fitting.



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

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

4. Install the heater and surge tank hose to the mounting clip.
5. Install the air intake tube.
6. Fill the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.

Heater Inlet Hose Replacement Avalanche/XLT LR4, LM7, LQ4

Tools Required

J 43181 Quick Connect Connector Removal Tool

1. Drain the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.
2. Remove the air intake tube.
3. Remove the heater and surge tank hose from the mounting clip.



4. Using the J 43181 disconnect the heater hose from the heater core inlet.

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

4.2.	Close the tool around the heater core pipe.

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

4.4.	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 engine.



6. Remove the inlet heater hose.

1. Install the inlet heater hose.



2. Install the inlet heater hose to the engine.
3. Connect the heater and surge tank hose to the heater core.

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

4. Install the heater and surge tank hose to the mounting clip.
5. Install the air intake tube.
6. Fill the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.