ST_330_72_1972_Chevrolet_Truck_Chassis_Service_Manual_10_to_30

BODY 1-4

Fig. 6—Windshield Glass, Weatherstrip and Sealing - Conv. Cab

6. Check the relationship of g lass to opening as follows: d. Apply se a le r to upper c o rn e rs as shown in Figure 6.
a. Inside edge of g lass to body flange.
b. Outer edge of g lass to p a ra lle l body m etal. OUTSIDE REAR VIEW MIRROR

7. M ark a re a s of body m etal or flange to be reform ed, R ear view m irro r installations are shown in Figure 11.
remove glass and co rrect as necessary. O ccasional tightening of mounting and assem bly bolts and
screw s will sharply d ecrease occurrence of failure due to
8. Recheck w indshield in its opening and if satisfactory door slamming or road shock.
proceed with installation.
INSTRUMENT PANEL COMPARTMENT AND LOCK
Installation
Replacement (Fig. 12)
CAUTION: Always wear gloves when handling glass. Removal of the entire assem bly including door may be

1. C entralize w eath erstrip around edge of glass to avoid accom plished by removing ten screw s just inside box
cocking of square c o rn e rs during assem bly. and compartment lamp wire (if so equipped). The door
may be removed, leaving the com partm ent intact, by
2. Install a cord around periphery of w eatherstrip, rem oval of four screw s and bum per shown in Figure 12.
leaving a loop at the top and the loose ends at the Access to the door stop bumper is gained by reaching
bottom as shown in Figure 9. up beneath instrum ent panel.

3. Place protective covering over plenum g rille, front Also shown in Figure 12 is the lock. Engagement of lock
fen d ers and hood. Apply s e a le r to w eath erstrip in in s trik e r may be adjusted by loosening s trik e r retaining
a re a s noted in Figure 7. screw s and moving the strik e r to desired position.

4. P lace windshield and w eath erstrip assem bly in open­ INSTRUMENT PANEL COVER ASSEMBLY
ing. With one technician lightly pushing in on wind­
shield, another technician within the cab should pull The instrum ent panel cover (fig. 13) is secured to the
on the cord as follows: instrum ent panel by studs, nuts and screw s. The studs
a. P ull on loose ends (fig. 10) until each is within are an integral p a rt of the cover assem bly.
2" of its respective upper corner.
b. P ull on loop until cord is within 2" of the upper Removal and Installation
corners.
c. Finish seating corners by simultaneously pull­ 1. Loosen or rem ove any n e ce ssa ry instrum ent panel
ing on both ends of the cord at each corner. item s, glove box, etc.
This will insure p ro p e r positioning of the c ritic a l
upper corners.

10-30 CHEVROLET TRUCK SERVICE MANUAL

BODY 1-5

Fig. 7—Rear Stationary Window Fig. 8— Loosening Weatherstrip

2. From underside of instrum ent panel rem ove attach­ of the grille at the forw ard corners.
ing screw s and carefully remove cover assembly. 6. Remove one (1) screw each side which is exposed

3. To in stall, re v e rse rem oval procedure. when the door is opened.
7. Inspect cowl hood ledge seal for fatigue or cuts and
COWL VENTILATOR GRILLE (Fig. 14-15)
The cowl ventilator intake, a louvered opening, ex­ replace if necessary.
8. Secure front edge of g rille over lip of hood se a l with
tends a c ro ss the top of the cowl. The opening perm its
outside a ir to enter into a plenum cham ber which dis­ six retaining screws.
trib u te s the a ir to both sides of the cab. A ir en ters into 9. R einstall windshield w iper arm s on pivot shafts.
cab through openings at right and left interior cowl 10. R everse rem oval procedure to install.
panels near the floor.
COWL AIR VENTILATOR VALVE ASSEMBLY
A ir flow is controlled by valves in the outlet openings.
Valves a re opened and closed by m eans of handles. Rep la cem e n t

Replacement Entire outlet valve assem bly may be removed from
1. Remove windshield w iper arm s from wiper pivot the vehicle by rem oving two screw s and depressing the
pins. Refer to Figure 16.
shafts.
2. Raise hood and rem ove screw s, retaining cowl venti­ WINDSHIELD WIPERS

lator grille and cowl hood ledge seal. W indshield w iper units on all models are of the two-
3. Remove four (4) screw s from the r e a r re ce sse d speed electric type. A single wiper motor unit, mounted
to center of cowl inside cab, power both wiper blades.
louvers. The wiper blade operating link rods and pivot mountings
4. Remove the six (6) screw s retaining the front of the on these models are located in the outside a ir inlet
plenum chamber.
grille to the cowl.
5. Remove the two la rg e r size screw s from each end

Fig. 7A — Cross Section of W indshield Weatherstrip (T yp ical) Fig. 9— Cord Installation

10-30 CHEVROLET TRUCK SERVICE MANUAL

BODY 1-6

Fig. 10—Pulling String to Seal Rubber Tip Fi 12_ lnstrument Panel Compartment Door (G lo ve Box)

Arm Adjustment

To adjust sweep of blades, turn on w ipers and note
sweep of a rm s. If n ecessary , rem ove one or both arm s
as follows: Pull outer end of arm away from glass which
will trip lock spring at base of arm and re le a se spring
from undercut of pivot shaft. While holding arm in this
position, pull outward on cap section at base of arm to
rem ove arm . Arm can be rein stalled in any one of

Fig. 11—Rear V iew Mirrors VIEW A

Fig. 14— Cowl V en tilato r G r ille Intake - Cab Models

10-30 CHEVROLET TRUCK SERVICE MANUAL