Feature Tip:
1999
Chevrolet Silverado Pick Up |
Courtesy of
Performance Achievement Group |
Note: Always wear
eye, hand and wrist protection while working on the vehicle. This vehicle is equipped with
dual airbags and will require additional cure time before releasing vehicle to the owner.
The Performance Achievement GroupLLC always recommends rapid curing two-part high viscosity urethane
for passenger side airbag equipped vehicles. Inform the vehicle owner of the cure time and
any other additional precautions before installation. Always return the vehicle to
manufacturers specifications.
Be sure to protect all interior and exterior portions of the vehicle to prevent any
damage.
I. Getting started:
In preparation for the windshield replacement, complete the
following steps: Protect the interior and exterior of the vehicle. Remove the mirror. It
is held in place with a #20 Torx screw. Disconnect the wires that attach to the mirror, if
equipped. Remove the side moldings, which are held in place with Torx screws. Now, gently
pry up on the plastic covers, remove the 13mm nuts that secure the wipers, and then remove
the wiper arms. The cowl panel is a three-part assembly. Lift the corner pieces up to
remove, which will expose the screws that fasten the main portion of the cowl. The corner
pieces are fastened with spring clips. Next, remove the "C" clips along the
front edge of the cowl, gently pry up, and remove the cowl panel from the vehicle. The top
molding is a rigid wrap around style molding that will need to be removed if cutting out
the windshield from the outside of the vehicle.
II. Removing the original windshield:
The windshield can be removed with any of the power cut out
tools available. A cold knife can only be used on the top and sides. The lower portion of
the windshield will need to be cut with a power tool. Setting blocks are not always used
at the OE level on this vehicle. If they are equipped, be careful not to damage them
during the cut out process. Performance Achievement Group recommends using the full-cut
out method. Using a sharp chisel or utility knife, remove the adhesive, leaving a thin
skin of well-bonded urethane on the pinchweld. Be careful not to disturb the body paint.
III. Preparing for the new windshield:
Prime the pinchweld according to your adhesive
manufacturer's specifications. Concentrate only on the areas of the paint that may have
been scratched or damaged during the removal process. The freshly cut urethane bed
provides the best bonding surface. Allow proper time for the primers to dry. Clean and
prime the windshield according to adhesive manufacturer's recommendations. The replacement
windshield will have the top molding attached to the glass. If you are re-using the
original glass, you may need to replace the molding.
IV. Placement of the new windshield:
Dry set the windshield into the opening, being sure to
properly adjust for proper alignment. Use a properly cut "V" notch tip to
duplicate the original bead size. Apply a high viscosity two-part adhesive to the glass.
The adhesive is applied along the pre-applied molding on the top, on the edge of the glass
on the sides, and will run up from the edge of the glass on the bottom. To determine the
position of the adhesive on the bottom, you may apply an acoustic baffling foam dam to the
pinchweld in the area just above the existing urethane. Then apply a very thin coat of
standard viscosity adhesive to the foam. Dry set the windshield for a reference point to
assure proper positioning of the adhesive bead on the bottom of the glass. Set the
windshield into the opening using your dry set marks for proper alignment, being careful
not to slide the windshield once it makes contact with the pinchweld.
V. Finishing Touches:
Re-install the sides and the cowl in reverse order. Be sure
the rubber flap in each corner of the cowl is replaced properly. This will cause an air
noise if not installed correctly. Place the wipers in their proper position and test.
Clean and prep the vehicle.
Written by
Phil Ochs of Performance Achievement Group
and
Michael Graves from Auto Glass
Specialists of Grand Rapids, MI branch.
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