The following procedure should be used to correct above condition.
1. Be sure weatherstrip is fully seated to rear compartment flange by striking weatherstrip every loomm (4 inches) using a 12 ounce mallet.
2. Screw overslam bumpers on rear compartment lid to full in position and close lid to check flushness of lid to quarters.
3. The rear compartment lid lock can be adjusted up or down and side to side for proper lock-to-striker engagement and to help flush lid. Adjust lock as outlined in Section 7 of the Body Service Manual.
"H" Sedan styles only (See Illustration) Steps 4, 5, and 6.
4. Remove trim over lid hinge.
5. Loosen screw (1) until dimension shown in Illustration is obtained.
6. Replace trim.
7. Check for water leaks using a hose with no nozzle attached, and correct as required.
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.