HIGH EFFORT MANUAL WINDOW REGULATOR (REWORK RUN CHANNEL)

SUBJECT: HIGH EFFORT MANUAL WINDOW REGULATOR (REWORK WINDOW RUN CHANNEL/INSTALL COUNTERBALANCE SPRING)

VEHICLES AFFECTED: 1991 "N" MODELS

CONDITION:

--------- Some owners of 1991 "N" cars may experience high effort when rolling the front windows up and down.

CAUSE:

----- Excess rubber on ends of window run channel.

CORRECTION:

---------- 1. Remove door trim panel according to instructions in Section 10-6 in the 1991 "N" Car Service Manual.

2. Remove outside mirror.

3. Remove window run channel.

4. Check measurement between mirror patch inboard and outboard sides of run channel, Figure 1 View A. If opening is less than 22 mm (7/8 inch), open mirror patch area to 22 mm (7/8 inch) by grinding.

5. Grind ends of window run channel 1.6 mm (1 /1 6 inch) deep as shown in Figure 1 Sections "C-C" a "D-D" and remove a length 90 mm at the front and 195 mm at the rear of the run channel as show in Figure 1 View A and View B.

6. Remove door window regulator assembly (Figure 2).

7. Remove production counterbalance spring using tool J 38864 (Figure 3).

8. Install counterbalance spring P/N 20053546 using tool J 38864 or equivalent.

9. Clean grease off regulator (lower sash cam and front window retainer), re-grease regulator with grease P/N 12345718 or equivalent.

10. Install door window regulator assembly.

11. Install window run channel.

12. Install outside mirror and door trim panel.

For vehicles repaired under warranty use:

Labour Time: 1.2 Hours each side

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.