PARTIAL WIPE/WASH PATTERN REAR WIPER-NEW COMPONENTS

SUBJECT: REAR WIPER SYSTEMS, PARTIAL WIPE AND WASH PATTERN (NEW COMPONENTS)

VEHICLES AFFECTED: 1990-91 U VANS

Application: 1990 and 1991 (Prior to V.I.N. Breakpoints)

Chevrolet MT110232 Oldsmobile MT301961 Pontiac MT205152

Conditions:

1. Partial wipe pattern at top of rear glass. (New blade available).

2. Washer pattern either too high / too low. (New arm and nozzle available). Original arm has nozzle (located approximately 1-1/4" from blade attachment. New arm has nozzle located approximately 2-1/4" from blade attachment.

3. Delay of washer fluid applied to glass after pushing button. (New check valve available). This item absent from early 1990 vehicles only. If check valve is present, check for latest type.

Corrections:

1. Replace wiper blade with new blade, P/N #22110869.

- Make sure that the larger bow on the wiper blade is positioned outboard on the wiper arm, as shown in Fig. 1.

- The blade may have a blue cap at the arm attachment area which should be pointed upward when installing to arm.

2. Replace wiper arm with new wiper arm, P/N #22109914.

- New arm has improved tension and relocated washer nozzle as shown in Figure 2.

a. Remove grommet from door panel and pull hose out approximately 6".

b. Secure hose at door side and cut hose approximately 3" forward of grommet.

c. Remove arm and blade from spindle and either transfer blade to new arm or install new blade (see item No. 1).

d. Cut hose on new arm approximately 3" forward of grommet and install new arm on spindle.

e. Splice hoses together using P/N #14047034 connector (or equivalent) and reposition grommet to door.

3. Add new check valve to washer system at washer bottle, as shown in Figure 3.

a. Cut hose approximate 1-1/2" from rear washer pump on washer bottle and splice hoses together with check valve, P/N #22102027 (note flow direction indicated by arrow on valve).

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.