GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1999 🢒 GMC P42 Commercial Chassis 🢒 Engine 🢒 Engine Electrical 🢒 Heater Hoses Replacement

Removal Procedure
  1. Drain the cooling system. Refer to Cooling System Draining and Filling .
  2. Remove the air intake tube. Refer to..
  3. Remove the heater hoses from the mounting clip.
  4. Disconnect the heater hoses from the heater core inlet and the outlet.

    5. Object Number: 363240 Size: SH
  5. Remove the inlet heater hose from the engine.

    6. Object Number: 363242 Size: SH
  6. Remove the outlet heater hose from the radiator.
  7. Remove the heater hoses.

Installation Procedure
  1. Install the heater hoses.

    2. Object Number: 363242 Size: SH
  2. Install the outlet heater hose to the radiator.

    3. Object Number: 363240 Size: SH
  3. Install the heater hose to the engine
  4. Connect the heater hoses to the heater core.
  5. Install the heater hoses to the mounting clip.
  6. Install the air intake tube. Refer to..
  7. Fill the cooling system. Refer to Cooling System Draining and Filling
  8. Inspect the cooling system for leaks.