GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1999 🢒 Monte Carlo 🢒 Engine 🢒 Engine Controls - 3.1L 🢒 Vacuum Modulator Replacement

Removal Procedure
  1. Disconnect the vacuum line at the vacuum modulator.

    2. Object Number: 10486 Size: SH
  2. Remove the attaching bolt (30) and the clamp (31) at the modulator base.
  3. Remove the vacuum modulator (32). Use care to avoid losing the modulator valve (34) from the transaxle case.
  4. Remove the O-ring (33).

Installation Procedure

    Object Number: 13050 Size: SH
  1. If removed, install the modulator valve (34).

    2. Object Number: 13051 Size: SH
  2. Install the new O-ring (33).
  3. Install the vacuum modulator (32).
  4. Install the clamp (31).

    5. 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.

  5. Install the attaching bolt (30).

    6. Tighten
    Tighten the attaching bolt to 27 N·m (20 lb ft).

  6. Connect the vacuum line at the vacuum modulator.