GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 1998 🢒 Riviera 🢒 Body and Accessories 🢒 Wipers/Washer Systems 🢒 Wiper Arm Tip Pressure Check, Blade Element Check

Wiper Arm Pressure Check
  1. Run the wiper arms to the mid-wipe position.
  2. Remove the blades from the wiper arms. Refer to Windshield Wiper Blade Replacement .
  3. Attach a scale to the wiper arm attaching pin and measure the force required to lift the wiper arm perpendicular to the windshield to normal working height (height with the blade attached).

    4. Object Number: 415980 Size: SH
  4. Replace the wiper arm if the measurement is not within the specification. Refer to Windshield Wiper Arm Replacement .

    5. Tip Pressure
    8.3-10.1 Newtons (30-36 oz).

Blade Element Set Check

    Object Number: 334256 Size: SH
  1. Remove the wiper blades from the wiper arms. Refer to Windshield Wiper Blade Replacement .
  2. Look down the length of the blade element.
  3. Replace the wiper blade element if the rubber element which contacts the glass is not on the centerline of the blade +/-15 degrees. Refer to Wiper Blade Element Replacement .
  4. Install the wiper blades on the wiper arms. Refer to Windshield Wiper Blade Replacement .