GENERAL INFORMATION 0-7
a vise using leather or wood on each side to prevent
damage to the cylinder,
7. Stake the retainer securely in place by staking the
cylinder metal over both edges of the retainer ends
using a suitable staking tool at right angles to the
top of the retainer and from the cast metal of the
cylinder over the retainer at each corner.
PUSHING, TOWING AND LIFTING
Pushing
NOTE:
Towing car to start is not recommended
due to the possibility of the disabled car ac-
celerating into tow car.
AUTOMATIC TRANSMISSION
Do not attempt to start the engine by pushing the car.
Should the battery become discharged, it will be neces-
sary to use an auxiliary battery with jumper cables to
start the engine.
CAUTION: To prevent damage to electrical
system, never connect booster batteries in ex-
cess of 12 volts and connect positive to positive
and negative to negative.
Manual Transmission
When a push start is necessary turn off all electrical
loads such as heater, radio, and if possible, lights, turn
on the key, depress the clutch, and place the shift lever
in high gear. Release the clutch when your speed reaches
10 to 15 miles per hour.
TOWING
The car may be towed safely on its rear wheels with
the (selector lever in "N" (Neutral) position at speeds
of 35 miles per hour or less under most conditions.
However, the drive shaft must be disconnected or the
car towed on its front wheels if 1) Tow speeds in excess
of 35 MPH are necessary, 2) Car must be towed for ex-
tended distances (over 50 miles) or, 3) Transmission is
not operating properly. If car is towed on its front
wheels, the steering wheel should be secured to maintain
a straight ahead position.
DRIVE ON HOIST
BUMPER JACK LIFTING AT FRAME ATTACHMENT ONLY
FLOOR JACK OR HOIST LIFT
Fig.
21-Vehicle Lifting Pointe-Chevroiet
CHEVROLET CHASSIS SERVICE MANUAL
HEATER AND AIR CONDITIONING 1A-65
Fig.
92—Chevrolet Four-Season Ducts
Installation
Reverse
assembly.
the removal procedure to reinstall the duct
Left Outlet Duct
Removal
1.
Remove the two parking brake lever bracket to
dash brace attaching screws and move the lever and
cable so they will not interfere with the duct
removal.
2.
Remove the screw and lock washer attaching the duct
outer bracket to the hinge pillar support.
3.
Remove the screws and lock washers attaching the
duct assembly to the dash brace bracket.
4.
Carefully pull the outer end of the duct downward,
detaching the courtesy light from its bracket.
5. Loosen the screws clamping the outlet duct to dis-
tributor assembly flexible tubing at the outlet duct.
The outlet duct may now be removed from beneath
the instrument panel.
6. The duct extension assembly and the deflector as-
sembly may be removed, if desired, as seen in
Figure 95.
Installation
The duct assembly is installed by reversing the re-
moval instructions.
Center Outlet Duct
Removal
1.
Remove the right and left console trim panels.
2.
Remove the radio receiver.
3.
Remove the electric clock.
4.
Remove the knobs, nuts and bezels from the two
air conditioning controls above the clock, AIR COND.
PULL and COLD IN-HOT PULL.
5. Carefully pull the outlet duct and control cables
loose from the rear of the center console and work
it down and out from under the dash. The left hand
control cable runs through the left hand flexible
tubing and may be left in the tubing after it is dis-
engaged from the duct. The right hand control cable
must also be pulled from the duct assembly as the
duct is removed.
6. The center deflector barrel assembly may now be
removed if necessary. Snap off the hairpin clips to
remove the barrel and spacer washers.
Installation
Reverse the removal procedure for installation.
AIR DISTRIBUTOR ASSEMBLY
Removal
1.
Drain the cooling system radiator.
2.
Remove the heater hoses from the core pipes and
remove the cover attaching nuts and cover surround-
ing the core pipes.
3.
Remove the glove compartment assembly and the
glove compartment door.
NOTE:.
See "Section 1 - Body" for removal
and installation of body items.
4.
Remove the right kick pad.
5. Remove the right and left center console trim panels.
6. Remove the radio receiver assembly.
7. Remove the defroster duct.
CHEVROLET CHASSIS SERVICE MANUAL
HEATER AND AIR CONDITIONING 1A-66
Fig.
93—Chevelle Four-Season Ducts
8. Remove the radio speaker and grille.
9. Remove the right outlet duct.
10.
Disconnect the bowden cables from their brackets
and operating levers on the distributor assembly.
11.
Disconnect the flexible tubing from the center and
left side outlet ducts at the air distributor assembly.
12.
Remove the heated air distributor ducts from the
air-distributor assembly.
13.
Remove the single remaining distributor to dash
panel attaching nut (the others were removed from
beneath the hood when the core cover was removed
in Step 2) located at the right end of the air dis-
tributor assembly.
14.
Carefully pull the assembly out from under the
dash, disconnecting the compressor switch wiring
connector and the water valve control switch vacuum
lines.
Installation
Reverse the removal procedure to reinstall the air
distributor assembly.
COMFORTRON AUTOMATIC
CONTROL COMPONENTS
The Comfortron system is the same as the Chevrolet
Four Season system insofar as the basic system compo-
nents are concerned. , Most removal and installation
procedures wUl remain as stated for the Four Season
system except where the automatic control components
are encountered. Each such component will be covered
in the pages which follow.
CHEVROLET CHASSIS SERVICE MANUAL
HEATER AND AIR CONDITIONING 1A-67
Fig.
94—Camaro Four-Season Ducts
Heater and Air Distributor Assembly
Removal
rfooo
1.
Disconnect battery ground cable.
2.
Drain radiator (do not purge refrigerant system).
3.
Disconnect all connectors attached to the Comfortron
wiring harness which are on the engine side of the
firewall. Push the wiring harness grommet through
the firewall to the rear.
4.
Disconnect the four vacuum hoses coming from the
underdash through the large firewall grommet. Push
the hose grommet through the firewall to the rear.
5.
Remove the nuts from the heater and air distributor
case studs which project through the firewall from
the dash side.
6. Disconnect the heater hoses from the core tubes.
Under Dash
1.
Remove glove box assembly.
2.
Remove the dash center face plate, ash tray assem-
bly, and any radio and/or tape equipment.
3.
Remove the Comfortron control assembly mounting
screws and lower the control unit.
4.
Remove the vacuum line from the kick pad valve
diaphragm.
5.
Disconnect all harness connectors between the Com-
fortron harness and the rest of the dash wiring.
6. Remove the air distributor duct which supplies the
dash outlets.
7.
Remove the screws attaching the heater and air
distributor to the firewall.
8. Pull the assembly rearward then down to remove
from the dash. Pull the Comfortron wiring harness
and vacuum hose assembly through the firewall.
Installation
1.
Place the entire case assembly with wiring, vacuum
hoses,
and control assembly into the car on the floor.
2.
Pass the underhood wiring harness and vacuum hose
harness as far as possible through the appropriate
firewall holes.
3.
Lift the assembly up into position and pass the case
studs through the firewall mounting holes. Attach
the case to the firewall with the mounting screws.
4.
Mount the dash outlet air distributor duct to the face
of the case.
CHEVROLET CHASSIS SERVICE MANUAL
HEATER AND AIR CONDITIONING 1A-68
Fig.
95—Corvette Four-Season Ducts
5. Connect the various Comfortron harness connectors
to the dash wiring and connect the vacuum hose to
the kick pad valve diaphragm. Push the vacuum hose
harness and wiring harness through the firewall to
the proper location and install their respective
grommets.
6. Raise the control unit into place and install the
mounting screws. Check that all connections are
complete.
7. Replace any radio and/or tape equipment, the ash
tray assembly, and face plate.
8. Replace the glove box assembly.
9. Connect the heater hoses to the core tubes, and
attach the nuts to the case studs through the firewall.
10.
Reconnect the four vacuum hoses as follows: Purple
to the cylinder on the thermo-vacuum valve, yellow
tracer to the body of the thermo-vacuum valve, red
tracer to the vacuum source "Tee" connection, and
white tracer to the vacuum tank inlet.
11.
Connect the wiring harness to the underhood air
conditioning components.
12.
Refill cooling system, connect battery ground cable
and check system performance.
Vacuum Tank
The vacuum tank is mounted on the firewall as shown
in Figure 97. Notice that the two vacuum lines are
clamped to the vacuum tank ports. *
Thermal Vacuum Valve
This heat operated vacuum valve is located in the
heater core input line. Figure 98 illustrates valve instal-
lation with clamps attaching the water hoses as well as
the vacuum hoses in place.
Resistor Assembly
Figure 99 illustrates the location and installation of
the blower speed resistor assembly.
Relays
Two relays are used in the system, both mounted on the
evaporator case as shown in Figure 100. The mounting
bracket forms a common ground for the relays and as a
plug for the hole in the evaporator housing used in the
Four Season system for resistor installation.
Sensors (Thermistors)
Ambient Switch and Sensor
This combination unit, which engages the compressor
clutch at about 40°F and also senses outside air tem-
perature and sun load, is mounted to the firewall within
the engine compartment with its long neck extending
deep into the cowl vent plenum chamber. Figure 98 il-
lustrates this installation,
In-Car Sensor
This sensor is located beneath the lip of the instru-
ment panel overhand just to the right of the driver as
shown in Figure 101.
Removal
1.
Remove glove box assembly.
2.
Disconnect sensor wires connector at harness.
3.
Remove sensor mounting screws, remove sensor
and pull wires and connector through hole in dash.
Installation
1.
Insert connector and
through the dash hole.
wires of replacement sensor
CHEVROLET CHASSIS SERVICE MANUAL
CORVETTE BODY 1B-4
Fig.
3-Hood Spacing
vehicle as a unit by removing six screws around the
outer edge of opening, two screws retaining striker plate
and four screws which fasten compartment support to
cowl cross brace under dash. For parts identification
refer to Figure 6.
COWL AREA TRIM
Figure 7 illustrates instrument panel pads, cowl
"kick'.' panels, radio grille cover and console-to-dash
trim panel.
Figure 8 illustrates trim and moldings which are in-
stalled in the console area.
When installing instrument panel pads, it is advisable
to use new clips. Position of these clips upon installation
is illustrated in Figure 9.
REAR VIEW MIRROR
Outside
Removal
The outside rear view mirror may be removed from
the'
door by removing the set screw, located on the in-
board side of the mirror support, with an alien wrench.
Installation
Mirror may be installed by following the removal
procedures in reverse order. ,
Inside
Installation of inside mirror may be seen in Figure 10.
Tension of mirror stud may be adjusted by loosening or
tightening adjusting screw.
SUN VISOR
Attachment of sun visor assembly to windshield header
is made as shown in Figure 10. Turning adjusting screw
in increases friction.
COWL VENTILATOR ASSEMBLY
The following outline covers either the right of left
hand side. Refer to Figure 11.
Removal
1.
Disconnect positive cable from battery.
CHEVROLET CHASSIS SERVICE MANUAL
CORVETTE BODY 1B-31
1
^JS^ST**-
Fig.
67—Center Body Construction
1.
Panel—Instrument
2.
Pad Assembly Instrument
Panel - Right
Hand
4.
Reinforcement -. Door
Upper Front
5. Panel - Door Inner
Upper
6. Reinforcement - Upper Rear
7. Cover - Front Access Hole
8. Reinforcement - Door Outer
Panel inner
9. Cover - Rear Access Hole
10.
Pillar Assembly - Door Lock
11.
Panel - Door Lower
Inner
12.
Sill - Door
13.
Molding - Rocker
14.
Panel - Side Door
Outer
15.
Panet - Door Hinge
Reinforcing
16.
Reinforcement Assembly
- Side Door Inner
17.
Bonding Strip - Side
Door Upper Bonding
18.
Pillar Panel - Hinge
19.
Hinge Assembly
20.
Pad Assembly Instrument
Panel - Left Hand
21.
Bracket - Radio Mounting
22.
Bracket - Clock Mounting
CHEVROLET CHASSIS SERVICE MANUAL
ENGINE-ELECTRICAL 6Y-23
condenser leak or to a defective connection. This
will cause burned points and ignition failure upon
initial starts and at high speeds.
4.
Capacity - Capacity is determined by the area of
the metallic elements and the insulating and im-
pregnating materials.
For a complete check of the condenser, use a tester
which will check for all of the above conditions. Follow
the instructions given by the manufacturer of the
test equipment. Condenser capacity should be
.18-:
23
microfarads.
REPLACEMENT
Four and Six Cylinder Engine Distributor (Fig. 4i)
1.
Release distributor cap hold-down screws, remove
cap and place it out of the work area.
2.
Remove rotor.
3.
Disconnect condenser lead wire from contact point
quick-disconnect terminal.
4.
Remove condenser attaching screw, lift.condenser
from breaker plate and wipe breaker plate clean.
5. Install new condenser using reverse of procedure
outlined above.
Eight Cylinder Engine Distributor
1.
Remove distributor cap.
2.
Loosen condenser lead attaching screw (fig. 6i) and
lift out condenser lead clip.
3.
Remove screw holding condenser bracket to breaker
plate and slide condenser from bracket.
4.
To replace condenser reverse the above procedure.
NOTE:
Make sure that new condenser lead is
installed in proper position (fig. 6i).
DISTRIBUTOR
(BREAKER POINT TYPE)
REMOVAL
1.
On radio equipped Corvettes, remove ignition shield
from over distributor and coil. One bolt is accessible
from top of shield, the other two are at rear of
shield, facing firewall.
2.
Release the distributor cap hold-down screws, re-
move the cap and place it clear of the work area.
NOTE:
If necessary, remove secondary leads
from the distributor cap after first marking the
cap tower for the lead to No. 1 cylinder. This
will aid in the reinstallation of leads in the cap.
3.
Disconnect the distributor primary lead from the coil
terminal.
4.
Scribe a realignment mark on the distributor bowl
and engine in line with the rotor segment.
5. Disconnect vacuum line to distributor and tachometer
drive cable (Corvette). Remove the distributor hold-
down bolt and elamp and remove the distributor from
the engine. Note position of vacuum advance mecha-
nism relative to the engine.
CAUTION: Avoid rotating the engine with the
distributor removed as the ignition timing will
be upset.
Rg.
121-L-6 Distributor-Exploded View
1.
Breaker Plate Attaching
Screws
2.
Condenser Attaching
Screws
3. Condenser
4.
Breaker Plate Assembly
4a.
Cam Lubricator
5. Vacuum Control Assembly
6. Vacuum Control
Attaching Screws
7. Housing
8. Cap
9. Rotor
DISASSEMBLY
10.
Contact Point
Attaching Screw
11.
Contact Point Assembly
12.
Weight Cover
Attaching Screws
13.
Weight Cover
14.
Weight Springs
15.
Advance Weights
16. Cam Assembly
17.
Main Shaft Assembly
18.
Roll Pin
19.
Drive Gear
It is advisable to place the distributor in a distributor
testing machine or synchroscope prior to disassembly.
CHEVROLET CU
SERVICE MANUAL