GM Service Manual Online
For 1990-2009 cars only

Heater Inlet Hose Replacement L18

Tools Required

J 43181 Quick Connect Connector Removal Tool

Removal Procedure

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

  4. Object Number: 362171  Size: SH
  5. Using the J 43181 disconnect the heater hose from the heater core inlet.
  6. 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.

    Object Number: 651354  Size: SH
  7. Remove the inlet heater hose (1) from the engine coolant inlet fitting.
  8. Remove the inlet heater hose.

Installation Procedure

  1. Install the inlet heater hose.

  2. Object Number: 651354  Size: SH
  3. Install the inlet heater hose (1) to the engine coolant inlet fitting.

  4. Object Number: 362171  Size: SH
  5. Connect the heater and surge tank hose to the heater core.
  6. Firmly push the quick connect onto the heater core pipe until you hear an audible click.

  7. Install the heater and surge tank hose to the mounting clip.
  8. Install the air intake tube.
  9. Fill the cooling system. Refer to Cooling System Draining and Filling .

Heater Inlet Hose Replacement LB7

Tools Required

J 43181 Quick Connect Connector Removal Tool

Removal Procedure

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

  4. Object Number: 362171  Size: SH
  5. Using the J 43181 disconnect the heater hose from the heater core inlet.
  6. 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.

    Object Number: 1765829  Size: SH
  7. Reposition the inlet heater hose clamp from the engine coolant outlet.
  8. Remove the inlet heater hose (1) from the engine coolant outlet.
  9. Remove the auxiliary inlet heater hose if equipped.
  10. Remove the inlet heater hose.

Installation Procedure

  1. Install the heater hose.
  2. Connect the auxiliary inlet heater hose if equipped.

  3. Object Number: 1765829  Size: SH
  4. Install the inlet heater hose (1) to the engine coolant outlet.
  5. Reposition the inlet heater hose clamp to the engine coolant outlet.

  6. Object Number: 362171  Size: SH
  7. Connect the heater and surge tank hoses to the heater core.
  8. Firmly push the quick connect onto the heater core pipe until you hear an audible click.

  9. Install the heater and surge tank hose to the mounting clip.
  10. Install the air intake tube.
  11. Fill the cooling system. Refer to Cooling System Draining and Filling .

Heater Inlet Hose Replacement L35

Tools Required

J 43181 Quick Connect Connector Removal Tool

Removal Procedure

  1. Drain the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.
  2. Remove the air intake tube.

  3. Object Number: 362171  Size: SH
  4. Using the J 43181 disconnect the heater hose from the heater core inlet.
  5. 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.

    Object Number: 363246  Size: SH
  6. Reposition the inlet heater hose clamp from the engine.
  7. Remove the inlet heater hose from the engine.

  8. Object Number: 363243  Size: SH
  9. Remove the inlet heater hose mounting bolt.
  10. Remove the inlet heater hose from the engine.
  11. Remove the inlet heater hose.

Installation Procedure


    Object Number: 363243  Size: SH
  1. Install the inlet heater hose.
  2. Install the inlet heater hose to the engine .
  3. Reposition the inlet heater hose clamp to the engine.
  4. 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.

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


    Object Number: 363246  Size: SH
  7. Install the inlet heater hose to the engine.
  8. Connect the heater hoses to the heater core.
  9. Firmly push the quick connect onto the heater core pipe until you hear an audible click.

  10. Install the air intake tube.
  11. Fill the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.

Heater Inlet Hose Replacement LR4,LM7,LQ4

Tools Required

J 43181 Quick Connect Connector Removal Tool

Removal Procedure

  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. Object Number: 362171  Size: SH
  5. Using the J 43181 disconnect the heater hose from the heater core inlet.
  6. 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.

    Object Number: 363237  Size: SH
  7. Remove the inlet heater hose from the engine.

  8. Object Number: 363118  Size: SH
  9. Remove the inlet heater hose.

Installation Procedure


    Object Number: 363118  Size: SH
  1. Install the inlet heater hose.

  2. Object Number: 363237  Size: SH
  3. Install the inlet heater hose to the engine.
  4. Connect the heater and surge tank hose to the heater core.
  5. Firmly push the quick connect onto the heater core pipe until you hear an audible click.

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