GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2007 🢒 LaCrosse 🢒 Engine 🢒 Engine Cooling 🢒 Throttle Body Heater Inlet Hose/Pipe Replacement

Removal Procedure
  1. Partially drain the cooling system. Refer to Cooling System Draining and Filling .

    2. Object Number: 785764 Size: SH
  2. Disconnect the following from the remote power steering fluid reservoir (1):
    3. • The brake booster hose
    • The wiring harness (2)

    Object Number: 785730 Size: SH
  3. Remove the remote power steering fluid reservoir mounting bolts (1, 3) ONLY, and position aside.
  4. Remove the wiper motor module in order to gain access to the rear of the throttle body heater inlet hose. Refer to Windshield Wiper Motor Replacement and Windshield Wiper System Module Replacement .

    5. Object Number: 785786 Size: SH
  5. Disconnect the heated oxygen sensor connector (2) from the rear of the throttle body heater inlet hose/pipe (3).
  6. Disconnect the throttle body heater inlet hose from the water crossover, using 90 degrees needlenose pliers.

    7. Object Number: 785821 Size: SH
  7. Disconnect the electrical connector (2) from the coil pack (1).

    8. Object Number: 785825 Size: SH
  8. Disconnect the following from the front of the throttle body heater inlet hose/pipe:
    9. • The camshaft position (CMP) sensor connector
    • The left knock sensor connector
    • The vacuum pipe retainer
  9. Disconnect the vacuum brake booster hose (3) from the vacuum source.
  10. Remove the bolts securing the throttle body heater inlet hose/pipe to the following:
    11. • The intake plenum (2)
    • The engine rear lift bracket
  11. Disconnect the throttle body heater inlet hose from the throttle body.

    12. Object Number: 802788 Size: SH
  12. Remove the throttle body heater inlet hose/pipe from the engine.

Installation Procedure

    Object Number: 802788 Size: SH
  1. Position the throttle body heater inlet hose/pipe to the engine.
  2. Connect the throttle body heater inlet hose to the throttle body.

    3. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 785825 Size: SH
  3. Install the bolts securing the throttle body heater inlet hose/pipe to the following:
    4. • The intake plenum (2)
    • The engine rear lift bracket

    Tighten
    Tighten the throttle body heater inlet hose/pipe bolts to 9 N·m (80 lb in).

  4. Connect the vacuum brake booster hose (3) to the vacuum source.
  5. Connect the following to the front of the throttle body heater inlet hose/pipe:
    6. • The CMP sensor connector
    • The left knock sensor connector
    • The vacuum pipe retainer

    Object Number: 785821 Size: SH
  6. Connect the electrical connector (2) to the coil pack (1).
  7. Connect the throttle body heater inlet hose to the water crossover, using 90 degrees needlenose pliers.

    8. Object Number: 785786 Size: SH
  8. Connect the heated oxygen sensor connector (2) to the rear of the throttle body heater inlet hose/pipe (3).
  9. Install the wiper motor module. Refer to Windshield Wiper Motor Replacement and Windshield Wiper System Module Replacement .

    10. Object Number: 785730 Size: SH
  10. Install the remote power steering fluid reservoir mounting bolts (1, 3).

    11. Tighten

        • Tighten the remote power steering fluid reservoir to intake plenum mounting bolts to 9 N·m (80 lb in).
        • Tighten the remote power steering fluid reservoir to cylinder head mounting bolt to 25 N·m (18 lb ft).

    Object Number: 785764 Size: SH
  11. Connect the following to the remote power steering fluid reservoir (1):
    12. • The brake booster hose
    • The wiring harness (2)
  12. Fill the cooling system. Refer to Cooling System Draining and Filling .