GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Oldsmobile 🢒 1998 🢒 LSS 🢒 Body and Accessories 🢒 Wiring Systems 🢒 Blower Motor Resistor Replacement

Removal Procedure

    Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

  1. Disconnect the negative battery cable.

    2. Object Number: 378608 Size: SH
  2. Remove the fuse block cover.

    3. Object Number: 378607 Size: SH
  3. Remove the center bolt from the multi use relay and fuse bracket.
  4. Remove the positive booster cable.
  5. Disconnect the underhood fuse blocks from the bracket.
  6. Disconnect the relays from the bracket.
  7. Remove the nuts which attach the multi-use relay and fuse bracket to the front of the dash.
  8. Remove the fuse bracket.

    9. Object Number: 331071 Size: SH
  9. Disconnect the connector (1) from the blower resistor assembly (3).
  10. Remove the screws (2) which retain the blower resistor to the heater and A/C module (5).
  11. Remove the blower resistor and gasket.

Installation Procedure

    Object Number: 331071 Size: SH
  1. Install the blower resistor and gasket.

    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 screws (2) which retain the blower resistor to the heater and A/C module.

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

  3. Connect the wiring connector (1) to the blower resistor.
  4. Install the nuts which attach the multi-use relay and fuse bracket to the front of the dash.

    5. Tighten
    Tighten the nuts to 3.8 N·m (34 lb in).


    Object Number: 378607 Size: SH
  5. Move the fuse blocks and the relay into position. Snap the fuse blocks and the relay to the bracket.
  6. Connect the positive booster cable to the multi-use relay and fuse bracket using the center bolt.

    7. Tighten
    Tighten the bolt to 10 N·m (89 lb in).


    Object Number: 378608 Size: SH
  7. Install the fuse block cover.
  8. Connect the negative battery cable.

    9. Tighten
    Tighten the negative battery cable to 15 N·m (11 lb ft).