GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 1998 🢒 Riviera 🢒 HVAC 🢒 HVAC Systems - Automatic 🢒 Mode Valve Actuator Replacement

Removal Procedure
  1. Remove the left side sound insulator. Refer to Instrument Panel Insulator Panel Replacement - Left Side in Instrument Panel, Gauges and Console.

    2. Object Number: 406217 Size: SH
  2. Remove the mode actuator retaining screws.
  3. Remove the mode actuator (2).

Installation Procedure

    Object Number: 406217 Size: SH
  1. Align the mode valve levers with the cam slots.
  2. Install the mode actuator (2).

    3. 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.

  3. Install the mode actuator retaining screws.

    4. Tighten
    Tighten the screws to 1.4 N·m (12 lb in).

  4. Install the left sound insulator. Refer to Instrument Panel Insulator Panel Replacement - Left Side in Instrument Panel, Gauges and Console.