GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1998 🢒 Astro - 4WD 🢒 Engine 🢒 Engine Mechanical - 4.3L 🢒 Drive Belt Replacement

Removal Procedure
  1. Remove the air cleaner assembly. Refer to Air Cleaner Assembly Replacement in Engine Controls.

    2. Object Number: 35885 Size: SH
  2. Remove the air cleaner outlet retaining nut (1).
  3. Remove the air cleaner outlet duct (2) from the throttle body assembly.

    4. Object Number: 423117 Size: SH
  4. Disconnect the IAT sensor harness connector.

    5. Object Number: 422129 Size: SH
  5. Loosen the air cleaner outlet duct from the MAF sensor.
  6. Remove the air cleaner outlet duct.

    7. Object Number: 177620 Size: SH
  7. Install a 3/8 inch drive wrench on the drive belt tensioner arm and rotate the arm counterclockwise.
  8. Remove the drive belt.
  9. Slowly release the tension on the drive belt tensioner arm.

Installation Procedure

    Object Number: 43858 Size: SH
  1. Route the belt over all the pulleys except the tensioner arm.
  2. Observe drive belt routing for vehicles without air conditioning.

    3. Object Number: 43859 Size: SH
  3. Observe drive belt routing for vehicles with air conditioning.

    4. Object Number: 177620 Size: SH
  4. Install a 3/8 inch drive wrench on the drive belt tensioner arm and rotate the arm counterclockwise.
  5. Install the drive belt over the drive belt tensioner pulley.
  6. Slowly release the tension on the tensioner arm.

    7. Object Number: 172992 Size: SH
  7. Inspect for the drive belt being properly installed on the pulleys.

    8. Object Number: 172993 Size: SH
  8. Avoid mis-positioning the drive belt by one or more grooves.

    9. Object Number: 172989 Size: SH
  9. Confirm for the proper drive belt size and the correct drive belt routing by observing the location of the fix pointer and the index marks on the drive belt tensioner. With a new drive belt installed, the fix pointer should align within the indentation on the drive belt tensioner.

    10. Object Number: 172991 Size: SH
  10. With a used drive belt installed, the fix pointer should not align past the index mark.
  11. Install the air cleaner outlet duct to the MAF sensor.

    12. Object Number: 422129 Size: SH

    Object Number: 423117 Size: SH
  12. Connect the IAT sensor harness connector.

    13. Object Number: 35885 Size: SH
  13. Install the air cleaner outlet duct (2) on the throttle body assembly.

    14. 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.

  14. Tighten the retaining nut (1).

    15. Tighten
    Tighten the retaining nut to 2 N·m (18 lb in).

  15. Install the air cleaner assembly. Refer to Air Cleaner Assembly Replacement in Engine Controls.