
HEATER AND AIR CONDITIONING 1A-70
Fig.
98—Comfortron Thermal Vacuum Valve
Power Servo .
The Power Servo is attached, to the distributor duct.
The entire installation consists of the Servo Assembly
and its link assembly to the TEMP door. The Servo is
attached to the Air Selector Duct as shown in Figure 108.
Mode Shift Vacuum Diaphragm
Replacement
1.
Remove the heater distributor from the vehicle.
2.
Reach into the distributor through the AIR door
opening to reach and remove the vacuum diaphragm
mounting screws and diaphragm to door link screw
(remove piug from case to reach this screw).
3.
Reverse this procedure to replace.
4.
Adjust mode door without vacuum applied to dia-
phragm. The door should be open one inch from
sealing against the air distributor opening (inside of
case).
(Figure 109).
HIGH BLOWER
DELAY RELAY
.MASTER
DELAY
RELAY
Fig.
100—Comfortron Relays
COLLISION PROCEDURE-AII Systems
Whenever a car equipped with air conditioning unit is
involed in a collision or wreck, it should be inspected as
soon as possible. The extent of damage to any or all of
the component parts and the length of time the system
has been exposed to the atmosphere will determine the
replacement of parts and processing that will be re-
quired. The greater the length of time of exposure to the
atmosphere, the greater will have been the chances for
air, moisture and dirt to have entered and damaged the
system. Every case may be entirely different so it is not
possible to establish a hard and fast procedure to follow
each time. Good judgment must be used to determine
what steps should be taken in each specific case.
The following procedure is presented as a guide for
Fig.
99—Comfortron Resistor Assembly
Fig.
101—Comfortron Sensor Installation
CHEVROLET CHASSIS SERVICE MANUAL

HEATER AND AIR CONDITIONING 1A-71
SUN-AMBIENT
SENSOR AND COMPRESSOR
CLUTCH SWITCH
HIGH BLOWER
DELAY RELAY
THERMAL
VACUUM
VALVE
Fig.
102-Comfortron Underhood Wiring
use when inspecting a damaged vehicle equipped with air
conditioning.
1.
Remove the drive belt. Cut belt off if necessary.
2.
Visually inspect the condenser, receiver-dehydrator,
compressor, mounting brackets, conditioning unit, all
connecting lines, and all controls to determine the
extent and nature of the damage.
a. No repairs, such as soldering, welding or braz-
ing, should be attempted on the condenser be-
cause of its construction. If the vapor passages
in the horizontal tubes or return bends or mani-
folds have been damaged in any way, the con-
denser should be replaced with a new one.
b.
The receiver-dehydrator should be replaced if
there is any evidence of its having sustained
either internal damage or a fracture at any of
the lines or welded joints or if the system has
been exposed to the atmosphere for an undeter-
mined period of time.
c. Examine the compressor for any visible external
damage.
d. The evaporator should be examined for damage
and, if necessary, removed or replaced or the
entire unit processed where damaged or exposed
to the atmosphere.
e. All connecting lines and flexible hoses should be
examined throughout their entire length for dam-
age.
If damaged in any manner, replace with new
lines.
f. Check all controls and connecting wires for
damage and replace with new parts where needed.
g. Check the clutch pulley for proper operation and
freedom from damage.
3.
Install gauge set.
4.
Purge the system. Pressure should not exceed 3 to
5 pounds.
5. Remove the compressor from mounting and remove
the oil test fitting.
6. Pour out the oil into a clean glass container and ex-
amine it for any foreign substance such as dirt,
water, metal particles, etc. If any of these are
present, the compressor and receiver-dehydrator
should be replaced and the other system components
should be flushed with liquid refrigerant.
7. If the oil is clean and free of any harmful substance,
replace oil with Frigidaire Oil available through
Parts Stock.
NOTE:
If the system components have been
replaced or flushed, replace the full charge of
oil. If not, add no more fresh oil than was
drained in Step 6.
8. Charge up the compressor to drum or can pressure
and leak test the compressor seals prior to in-
stallation of compressor.
9. Reinstall the compressor and evacuate the system
by following the Evacuating Procedure.
CHEVROLET CHASSIS SERVICE MANUAL

CORVETTE BODY 1B-2
Fig.
1—Steel
Reinforcing Members
by loosening the hinge retaining bolts (lower) and moving
the hood to the limit of slotted holes in hinge strap.
The upper surface of hood may be brought flush with
adjacent surfaces by shimming under hinges and adjust-
ment of bumper screw and catch bolt engagement. Figure
3 illustrates desired spacing.
Hood Catch
The hood catch should be adjusted so that catch bolts
enter lock plates freely and catch bolt length should be
adjusted so that rubber bumpers are slightly compressed
in latched position.
Entrance of catch bolt into the plate may be adjusted
by loosening the three catch bolt mounting screws enough
to allow movement of bolt assembly.
Synchronization of catch release may be made by ad-
justing the cable retainer located at left hand catch plate
assembly.
HOOD ASSEMBLY
Removal
1.
If hood is to be reinstalled, scribe a line around hood
hinge upper strap as shown in Figure 4.
2.
With aid of a helper to support hood, remove screws
retaining hinge straps and support assembly to hood.
If hinges are removed from vehicle, note amount of
shims under each hinge.
Installation
In replacing original hood, align hinge with scribe
marks made on removal and install retaining screws re-
moved from hinges and support.
If adjustment is required, proceed as outlined in this
section under Adjustments - Hood - Hood Catch.
HOOD PROP
Safety Retention Feature
When extended under hood service operations are
anticipated, the hood prop track and slide should be se-
cured by placing a 1/4" bolt and nut through the existing
holes.
This will prevent accidental closing of the hood
that could result in a serious injury.
FRONT EMBLEM
The front emblem is retained by special nuts which
may be reached by raising hood (fig. 5).
wiper arm on side of car
VENT GRILLES
Removal
1.
Remove windshield
affected.
2.
Remove four screws attaching grille to body (fig. 5).
3.
Lift grille far enough to gain access to windshield
washer hose and remove hose from nozzle.
4.
Remove grille from vehicle.
Installation
Grille may be installed by following removal procedure
in reverse order.
INSTRUMENT PANEL TRAY
The instrument panel tray may be removed from the
CHEVROLET CHASSIS SERVICE MANUAL

CORVETTE BODY
1B-6
ASH TRAY
SET SCREW
(PART
OF
KNOB)
TENSION
ADJUSTING
SCREWS
Fig.
8—Console Trim
cracks",
the
windshield opening must
be
carefully
checked
for
irregularities
and
deformation.
To
check
windshield opening proceed
as
follows:
1.
With weatherstrip
and all
foreign material removed
from perimeter
of
opening and with molding clips
in
place, install windshield checking blocks (Special
Tool J-8942)
as
shown in Figure 17. Note that check-
ing blocks must
be
placed over molding clips
to
obtain proper alignment.
2.
Place
a new
windshield glass
in
opening, resting on
J-8942 blocks
as
shown in Figure
18.
3.
Check
fit of
glass carefully. Space between glass
and frame should not vary more than 1/8".
4.
Mark
and
repair
any
imperfections. Recheck
fit as
required.
Fig.
9—Special Clip
Fig.
10—Sun Visor and Inside Rear View Mirror
Installation
1.
Carefully clean
all
loose material
out of
windshield
frame
(fig. 19).
2.
Install
new
molding clips (Item
9, fig. 12).
Both
models
use 13
type
B
clips equally spaced on lower
frame section.
37
Models use 11 type A clips equally
spaced on the top frame section.
3.
Apply
a
bead
of gun
grade body sealer such
as
3M-1170
in
apex
of
windshield frame
as
shown
in
Figure
20.
4.
Install weatherstrip on windshield glass.
5. Starting
at
bottom center
of
glass, insert
a
piece
of
heavy cord such
as
chalk line,
etc. in
groove
of
weatherstrip.
Cut
cord long enough so that about 10"
of free length exists after going around windshield.
Knot ends
of
cord together where they meet at bot-
tom center
of
glass
and
draw knot into groove
(fig.
21).
Tape loose ends
to
inside surface
of
glass
as
shown.
6. Place weatherstrip windshield assembly
in
wind-
shield frame. From inside
of
vehicle grasp ends
of
cord and pull toward you.
It is
wise to have an assis-
tant exert gentle
but
firm pressure
on
outside sur-
face
of
glass
in the
area where string
is
emerging
from weatherstrip. Figure
22
illustrates action
of
string
on
weatherstrip.
Lip of
seal
is
pulled out of
frame apex and over pinchweld flange.
7. When string
has
been removed, carefully inspect
seating
of lip
over entire perimeter
of
windshield,
paying particular attention to corners.
8. Apply
2
beads
of
sealer on outer surface
of
weather-
strip
as
shown
in
Figure
23.
Inject
a
moderate
quantity
of
windshield cement such
as
3M-6699B
between windshield glass
and
weatherstrip using
pressure gun
as
shown
in
Figure
23.
9. Install lower reveal molding, aligning
it
with mark
made upon disassembly. Refer
to
Figure
12,
View
A, before attempting installation; note that flange
of
molding
and
clips (item
9) at
ends
of
molding must
pass between molding retaining clips and windshield
frame.
li
difficulty
is met in
engaging molding
flange with retaining clips,
a
piece
of
shim stock
may
be
used
as a
"shoe horn"
to
place flange be-
hind clips.
10.
Install
in
order named: Upper reveal molding (align-
ing marks made
at
disassembly); side weatherstrip
CHEVROLET CHASSIS SERVICE MANUAL

CORVETTE BODY
1B-7
HEAT
CONTROL
€P-
CABLE
VIEW A
HOOD RELEASE
Fig.
11—Cowl Ventilator
and
Controls
and reveal moldings; upper garnish molding; lower
garnish molding; side garnish molding; header latch
plates on 19467 Models and rear view mirror.
11.
Clean
up
excess sealer
and
cement with rag damp-
ened with oleum spirits, prep-sol
or
kerosene;
in-
stall wiper arm assemblies.
DOORS
ADJUSTMENTS
Door Lock Striker
Door lock strikers incorporate
an
inter-lock feature
consisting
of a
notch
in the
striker into which the lock
bolt housing extension engages. With
the
inter-lock
feature
it is
very important that
the
lock extension en-
gages properly
in the
striker notch
and
that, where
necessary,
the
correct striker emergency spacers
are
used to obtain proper engagement.
1.
To
adjust striker
up,
down,
in, or
out loosen striker
plate screws and shift striker and adjusting plates
as
required, then tighten screws.
2.
To determine
if
door lock striker emergency spacers
are required, apply modeling clay
or
body caulking
compound
in the
door lock striker notch where
the
lock extension engages,
and
then close
the
door
to
form
a
measurable impression in the clay
or
caulk-
ing compound,
as
shown
in
Figure
24.
Remove
all
clay
or
compound when adjustment
is
completed.
When dimension
"A"
from inside face
of
striker teeth
to center
of
lock extension
is
less than 3/16", install
emergency spacers
and
proper length striker attaching
screws.
NOTE:
Dimension
"B"
from center
of
lock
extension
to
inside face
of
striker notch should
.
never be less than 1/8".
If check indicates need
for
emergency spacers,
pro-
ceed
as
follows:
1.
With pencil, scribe position
of
striker on body pillar.
2.
Remove three door lock striker attaching screws and
remove striker
and
adjusting plates from pillar.
3.
To
install, place striker, shims and adjusting plates
within scribe marks
on
pillar
and
tighten screws.
IMPORTANT: Whenever
a
door
has
been
re-
moved
and
installed,
or
realigned,
the
door
SHOULD NOT be closed completely until
a
visual
check
is
made to determine
if
the lock extension/
will engage
in the
striker notch. Where
re-
quired, door lock striker emergency spacers
should
be
installed
so
that door
can be
closed
and
an
accurate check made to determine emer-
gency spacer requirements.
Door Window and Vent Adjustment
To move
the top of the
window
in or
out, the bottom
ends
of
both
run
channels
are
adjustable.
The
rear
channel
is
adjusted
by
loosening
the
lower
of
the two
screws
on the
rear face
of
door, "C" Figure 25, and
moving channel
as
necessary.
The
front channel
is ad-
justed
by
removing
the
trim pad and moving the Channel
in
or out by a
stud
and nut
adjustment, "B" Figure 25.
The
top end of the
rear channel
is
not adjustable in
or
out.
On 19467 models
an
adjustment
may be
made
to the
closed-door relationship
of the
vent assembly
to the
windshield frame. This adjustment
is
controlled
by the
stud-nut assembly "B" Figure
25.
The closed position
of the
window
is
controlled
by
bumper assemblies located
at
each end
of
window frame
as shown
in
Figure
26.
^
Access
to
bumper retaining
screw
may be
gained through holes
"D" and
"E"
in
Figure
25.
Door Hinges
The position
of the
door assembly in the body opening
is adjusted
by the
striker plate position covered
pre-
viously
and the
position
of the
door
on
the hinge rear
CHEVROLET
a
SERVICE

CORVETTE BODY 1B-40
Fig.
88—Applying Sealer to Frame
To replace panel, proceed as follows:
1.
Cut out damaged panel with a hacksaw blade and
thoroughly remove all dirt and paint from the under-
side of the old panel or panels for a distance of
approximately 2 to 3 inches back from the attaching
line.
2.
Remove the paint from the finish side, for a distance
of 2 to 3 inches on the panel adjacent to the replace-
ment panel location with lacquer solvent, or its
equivalent.
Scuff the surface on both the replacement panel and
adjacent panel for a distance of 2 to 3 inches back
from the attaching line and wipe clean.
Bevel all attaching edges at approximately 30° across
the entire thickness of the plastic so a single "V"
butt joint will be formed on the finish surface when
3.
4.
Fig. 90—Pulling Cord From Weatherstrip
the pieces are joined. If the replacement panel does
not fit closely to the break, reshape to suit.
5.
Cut two backup pieces of woven glass fiber cloth
to run the entire length of the joint or shorter
lengths of fiber cloth may be lapped over entire
length of joint, also cut wide enough to lap the
junction line on either side by two or three inches.
6. Prepare a sufficient amount of liquid plastic in an
un-waxed paper cup by mixing resin with hardener
(See Resin Repair procedure).
7.
Align replacement panel, then clamp panel in place
to form a closed "V" butt joint at the panel junction.
When panel cannot be clamped, use 3/1.6" bolts with
large washer on inner and outer of panel to hold
panels in alignment or use straps and sheet metal
screws.
Fig. 89—Installing Window Assembly
Fig. 91—Applying Sealer to Weatherstrip
CHEVROLET CHASSIS SERVICE MANUAL

CORVETTE BODY 1B-41
Fig.
92—Applying Cement to Window
8. Impregnate backup plies of woven glass cloth with
prepared plastic mixture by dipping or brushing.
Remove excess plastic from cloth by squeezing.
9. Place impregnated backup plies on underside of
panels. If necessary, hold backup plies in place with
paper until plastic "gels."
10.
Prepare another plastic mixture of resin and
hardener and mix thoroughly. To this mixture add
Fig.
93—Removing Feeler Stock
cut glass fiber (1/2" lengths) until mixture has a
putty-like consistency, or utilize glass cloth.
11.
Fill "V" groove with reinforced plastic material
or saturated glass cloth. Build up surrounding area
with sufficient material to allow for finish
operations.
12.
Allow patch to harden.
1.3. File or sand (#80-D sandpaper) to general panel
contour.
14.
Allow plastic fill to harden, then sand, preparatory
to paint operations.
HARD TOP
CARE AND STORAGE
The outside painted finish of the hard top should be
cleaned the same way as the rest of the car. The inside
headlining should be cleaned as outlined under Cleaning
Soft Trim.
When not using hard top, store it indoors where it can
be kept clean and dry. If the top is to be stored for a long
period of time, keep it covered to avoid dirt settling on
top and headlining. It is not advisable, however, to wrap
top assembly in a manner which will stop air circulation.
The hard top rear window is plexiglas and should be
cared for in exactly the same manner as outlined for the
convertible top rear window (see Care of Folding Top
in this section). Never scrape ice from rear window-
scratches are sure to result.
REAR WINDOW
Consult Figures 83 and 84 for parts identification.
Removal
1.
Remove hard top from vehicle. Place protective
covering over headlining.
2.
Remove screws retaining lower reveal moldings and
cap.
3.
Mark position of right hand upper reveal molding
end on top (fig. 85) and pry molding out of weather-
strip.
Repeat on left hand molding.
4.
Remove rear garnish moldings as outlined farther
on in this section.
5. Working from inside of top, carefully work weather-
strip from frame flange and push weatherstrip-
window assembly toward rear of top until free of
window frame.
6. Remove weatherstrip from window and inspect care-
fully. If weatherstrip is damaged, it should be dis-
carded. If it is in usable condition, clean off all
foreign material.
Installation
1.
Clean window frame of all old sealer, dirt, etc.
Remove and discard upper reveal molding retainers.
2.
Install twelve new upper reveal molding retainers
using mark made when removing reveal moldings
as guide. The two middle retainers should be 2"
center to center, those remaining should be approxi-
mately 7" apart as shown in Figure 86.
3.
As an aid to engaging reveal moldings in retainers
later on, place a short length of feeler stock behind
each as shown in Figure 87.
4.
Install weatherstrip on window.
CHEVROLET CHASSIS SERVICE MANUAL

CORVETTE BODY 1B-42
Fig.
94—Garnish Moldings and Latch
1.
Molding - Latch
2.
Latch Assembly
3. Molding - Forward Header
4. Molding - Rear Upper
5. Molding - Rear Lower
6. Molding - Side
7. Molding - Forward Comer
8. Guide
8.
9,
Starting at bottom center of glass, insert a piece of
heavy cord, such as chalk line, in groove of weather-
strip.
Cut the cord long enough so that about 10" of
free length exists at- each end after going around the
weatherstrip. Tie ends of the cord together in over-
hand knot and tape loose ends to inside surface glass.
Masking tape may be used to hold weatherstrip to
glass (fig. 89).
Apply a bead of sealer such as 3M1170 or equivalent
to apex of frame as shown in Figure 88.
Place window assembly in opening as shown in
Figure 89.
Grasp ends of cord and pull toward front of top
assembly. Exert gentle but firm pressure on outside
of window in the area where string is emerging from
weatherstrip. Figure 90 shows action of string on
weatherstrip; lip of seal is pulled out of frame apex
and over frame flange.
When string has been removed, carefully inspect
seating of lip over entire perimeter of window,
paying particular attention to corners. Remove tape
strips if used.
10.
Apply a band of sealer in groove formed by weather-
strip and edge of window opening as shown in Figure
91.
11.
Inject a moderate quantity of cement (3M-6699B or
its equivalent) between window and weatherstrip as
shown in Figure 92.
12.
Install garnish and reveal moldings in reverse order
of removal. Note that upper reveal molding flanges
must pass between retainer and feeler stock. Feeler
stock is removed as molding is installed as shown
in Figure 93.
GARNISH MOLDINGS AND LATCHES
Figure 94 shows garnish molding and latch installation.
Note that latch may be adjusted to regulate header weath-
erstrip pressure on windshield frame. To adjust latch,
mark original position, loosen mounting screws and move
latch in desired direction. Be sure latch is engaged in
serrations before tightening mounting screws.
When removing garnish moldings, note that short
moldings under latches (Item I, Figure 94) are the
CHEVROLET CHASSIS SERVICE MANUAL