GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1998 🢒 Cavalier 🢒 HVAC 🢒 HVAC Systems - Manual 🢒 Heater Pipes Replacement

Removal Procedure
  1. Drain the engine coolant. Refer to Cooling System Draining and Filling in Engine Cooling.

    2. Object Number: 302665 Size: SH
  2. Disconnect the heater core to heater pipe hoses from the heater pipe assembly.
  3. Disconnect the heater pipe hose at the coolant outlet on the engine.
  4. Disconnect the heater pipe hose at the coolant inlet on the engine.
  5. Remove the bolts and the nuts that retain the pipe to the engine.
  6. Remove the heater pipe assembly.

Installation Procedure

    Object Number: 302665 Size: SH
  1. Install the heater pipe assembly.

    2. 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.

  2. Install the bolts and nuts in order to retain the pipe to the engine.

    3. Tighten
    Tighten the bolt and the nut to 25 N·m (18 lb ft).

  3. Connect the heater pipe hose to the coolant inlet on the engine.
  4. Connect the heater pipe hose to the coolant outlet on the engine.
  5. Connect the heater core to heater pipe hoses from the heater pipe assembly.
  6. Refill the engine coolant. Refer to Cooling System Draining and Filling in Engine Cooling.