GM Service Manual Online
For 1990-2009 cars only

Heater Inlet Hose Replacement LZE, LZ4, LGD

Special Tools

J 38185 Hose Clamp Pliers

Removal Procedure

  1. Drain the coolant. Refer to Cooling System Draining and Filling.
  2. Remove the surge tank from the surge tank bracket.
  3. Reposition the heater inlet hose clamp at the heater core using the J 38185 Hose Clamp Pliers .
  4. Reposition the heater inlet hose clamp at the engine using the J 38185 Hose Clamp Pliers .

  5. Object Number: 1203444  Size: SH
  6. Remove the heater inlet hose from the heater core.
  7. Remove the heater inlet hose from the engine.
  8. Remove both heater inlet hose clamps from the heater inlet hose.

Installation Procedure

  1. Install both heater inlet hose clamps to the heater inlet hose.

  2. Object Number: 1203444  Size: SH
  3. Install the heater inlet hose to the engine.
  4. Install the heater inlet hose to the heater core.
  5. Reposition the heater inlet hose clamp at the engine using the J 38185 Hose Clamp Pliers .
  6. Reposition the heater inlet hose clamp at the heater core using the J 38185 Hose Clamp Pliers .
  7. Install the surge tank to the surge tank bracket.
  8. Fill the coolant. Refer to Cooling System Draining and Filling.

Heater Inlet Hose Replacement LS4

Special Tools

J 38185 Hose Clamp Pliers

Removal Procedure

  1. Drain the cooling system. Refer to Cooling System Draining and Filling.

  2. Object Number: 1699794  Size: SH
  3. Use J 38185 Hose Clamp Pliers to reposition the heater inlet hose clamp at the heater pipe.
  4. Note: Cap or plug the cooling components to prevent system contamination.

  5. Remove the heater inlet hose (1) from the heater pipe.

  6. Object Number: 1699795  Size: SH
  7. Use J 38185 Hose Clamp Pliers to reposition the heater inlet hose clamp at the heater core.
  8. Remove the heater inlet hose (1) from the heater core.

Installation Procedure


    Object Number: 1699795  Size: SH
  1. Connect heater inlet hose (1) to the heater core.
  2. Use J 38185 Hose Clamp Pliers to reposition the heater inlet hose to the heater core clamp.

  3. Object Number: 1699794  Size: SH
  4. Install the heater inlet hose (1) to the heater pipe.
  5. Use J 38185 Hose Clamp Pliers to reposition the heater inlet hose to the heater pipe clamp.
  6. Fill the cooling system. Refer to Cooling System Draining and Filling.