GMC 4000 Series Service Manual page 47

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CONVENTIONAL C A B ^
Figure 2 0 — Adjusting Vent W indow Tension
Figure 2 1 — Vent W in d o w Attachment
Figure 2 2 — Replacing Vent W in do w
as shown in figure 20, turn adjustment nut with a
^-inch speed wrench to obtain five to seven pounds
torque, while moving vent window from a ten-
degree open position to a full-open position. Use
either a push or pull type spring scale, positioned
at rear edge of vent glass. Turning adjustment nut
clockwise increases operating tension.
3. Install door access panel.
DOOR VENT W IN D O W ASSEMBLY
REPLACEMENT
REMOVAL
The channel between the door window glass
and the door vent is part of, and is removed with,
the vent window assembly.
1. Regulate the window to the full down position.
2. Remove the access panel from door inner
panel as directed previously under "Door Access
Panel Replacement."
3. Remove lower two channel retaining screws
from door inner panel bracket (fig. 21).
4. Remove three screws which attach vent
framing to door (fig. 21).
5. Rotate the vent window assembly and care­
fully lift it up and out of door (fig. 22).
INSTALLATION
1. With window glass down, lower the glass
channel portion of vent assembly down into the