Your team has just completed repairs on the front cab door of a 2007 GMC Sierra. As part of the repair process, it was necessary to blend the rear cab door to achieve a proper color match.
A final quality control inspection was performed, and you noticed vertical lines in the rear door that didn’t look normal. Was this condition part of the accident or was it a factory defect?
Manufacturers often publish Technical Service Bulletins (TSBs) that describe such situations. If you aren’t aware of these TSBs, you may end up performing unnecessary repairs to correct factory defects.
This article will explain a published procedure to correct vertical lines in the rear outer cab door panels on 2007 GMC Sierras and 2007 Chevrolet Silverados.
Some customers may notice two vertical lines in the outer panel. The perimeter of the deadener may show up in the outer panel surface when cold (figure 1). Why? The sound deadener on the inside of the doors contracts and expands differently than the outer panel. Repair paint on affected areas using standard labor times and procedures, then install door body side moldings and mud splats.
Always refer to ALLDATA for safety procedures, identification of material types and trim panel removal
Always refer to General Motors for questions relating to applicable or non-applicable warranty repair information.
Replace the sound deadener.
IMPORTANT (figure 2): Be careful not to damage the plastic bezel behind the door handle (1) that accesses one retaining screw. Also be careful when removing the power window switch (2).
Remove the switch by pushing forward and lifting from the rear of the switch.
• Remove the door trim.
• Remove the water deflector.
• The sound deadener to be removed is shown in figure 3.
IMPORTANT: Do not twist the putty knife when
removing the deadener.
• The deadener can be collapsed by tapping on the center. After you have collapsed the center, you can lay a putty knife under the deadener and pry it off the door (figure 4). After the center has been removed, a mallet may be needed to tap on the putty knife to remove the outer perimeter of the deadener. Remove most of the deadener until it’s smooth (figure 5).
• Vacuum out the bottom of the door.
• Apply the new deadener to the outer panel in the old location.
• Reinstall the water deflector and the trim.
Writer Dan Espersen is the ALLDATA CollisionConnectSM Program Manager. Espersen is I-CAR Platinum Certified, a Gold Pin Member of the Collision Industry Conference (CIC) and holds an AA degree in Automotive Technology. He has 15 years of experience in the collision industry and 17 years of experience in the automotive industry.
© 2007 ALLDATA LLC. All rights reserved. All technical information, images and specifications are from the ALLDATA Product. ALLDATA is a registered trademark of ALLDATA LLC. All other marks are the property of their respective holders. General Motors, GMC, Chevrolet, Silverado and Sierra are registered trademarks of the General Motors Corporation and are being used solely for reference and application purposes.