FIGURE 1:

To reduce door glass water and air leaks on the 1988 C/K model, a new door glass and run channel seal has been developed. The upper rear corner of the new glass is square shaped, while the old style is more rounded (Figure No. 1). When installing a new door glass, a new run channel seal and window retainer ("blow-out-chip") must be installed. A new door glass with the old run channel seal, or viceversa, will not work.
SERVICE PROCEDURES

Glass and Run Channel Seal Replacement
1. Section 10A1-14 of the 1988 C/K Service Manual identifies the procedures for door glass and run channel seal replacement.

Window Retainer ("Blow-Out-Clip") Replacement
1. Remove run channel seal.

2. Using a 1/8" drill bit, drill the heads of the two rivets.

Notice: Exercise care to remove only the head of the rivet. The labor operation and labor time to replace the door glass, run channel seal and window retainer is:
Labor Op: T7580 Labor Time: .9 hrs (one side)

T7585 1.6 hrs (both

sides)

NEW PARTS INFORMATION

Description Part Number
L.H. Door Glass Tinted 15612851
L.H. Door Glass Clear 15612849

R.H. Door Glass Tinted 15612852
R.H. Door Glass Clear 15612850

L.H. Run Channel Seal 15612981
R.H. Run Channel Seal 15612982

Retainer ("Blow-Out-Clip") 15612855

Rivets (2 each side) .125 x .063 x .125

The new door glass went into production beginning with the following VIN breakpoints:

GMC JE514159

GMC J1526010

GMC JZ513360

Door (Glass) - Updated Run Channels

FIGURE 1: