1967 CHEVROLET CAMARO ground clearance

HEATER AND AIR CONDITIONING 1A-3

linkage of this lever which will provide partial airflow

only to the defroster duct and which should be used for,

all normal defogging operations.

CORVETTE

Heater components are attached to the dash panel on

the right side of the vehicle with the air inlet assembly

on the engine side and the heater and air distributor

assemblies beneath the instrument panel within the pas-

senger compartment.

The heater operates on outside air only with the blower

receiving its air flow from the cowl vent plenum

chamber.

No water valve is utilized in the system. Therefore,

water flows through the heater core constantly while

the engine is running, keeping the core at maximum

temperature at all times.

Airflow through the system is shown in Figure 1.

Controls

Two knobs control all heater operations:

The FAN-TEMP knob is rotated to turn the blower

on and off and control blower speed and is pulled out

as desired to regulate heater temperature.

The AIR-DEF knob is the air on-and-off control as

well as the defroster control.

Temperature Damper: Door

At the heart of the heater operation is the temperature

damper door. Air from the blower follows parallel paths

through the distributor duct, with one path passing

through the heater core and the other path bypassing the

core.

The temperature damper door is placed in the duct

so that, when closed, the path of the heated air leaving

the heater core is blocked while the ambient air path

remains open. Positive closing of this door when no

heat is being called for is assured by a cam assembly

at the door operating lever. As the FAN-TEMP knob

is pulled out, the damper door is opened accordingly,

allowing varying proportions of heated air to mix with

the unheated airflow, thus providing heater outlet tem-

perature control. With the knob pulled fully out the
Fig.
4—Heater Controls (Corvette)

ambient air path is blocked and all airflow passes

through the heater core. Final heater output temperature

is dependent upon the proportion of heated and ambient

air blended together according* to the setting of the

temperature damper door.

Air and Defrost Damper Doors

Beyond the temperature damper door are the air door

and the defroster door, both operated through a single

bowden cable by the AIR-DEF knob. The first half of the

travel of this knob opens the AIR door allowing the

airflow to pass into the interior of the car through the

floor distributor openings. Pulling the AIR-DEF knob

fully out causes the defroster door to open, diverting

this airflow to the defroster ducts for defogging, de-

frosting or deicing operations.

NOTE: Since this knob is the air on-or-off

control, it should be pulled at least halfway out

before turning on the blower.

Fan Control

Rotate the FAN-TEMP knob to operate the three-

speed blower, increasing the velocity of the air through

the heater. The fully counter-clockwise position of the

knob is the off position. Turn clockwise to the desired

blower speed; fully clockwise for high blower speed.

COMPONENT REPLACEMENT AND REPAIR

CHEVROLET, CHEVELLE, AND CAMARO

Blower Assembly

Removal

1.
Disconnect battery ground cable.

2.
Unclip heater hoses from fender skirt.

3.
(Chevrolet and Camaro) Remove right front fender

and skirt assembly. (See Section 11 of the Service

Shop Manual)

(Chevelle) Move the vehicle front wheels to the

extreme right turn position. Remove all right front

fender retaining bolts. Allow the skirt to drop and

rest on top of the tire. To gain maximum clearance

for access to the blower motor attaching screws, a

block of wood may be wedged between the fender

lower flange and the top of the fender skirt. Position

the wood block so that the rear portion of the skirt

will be forced down and inboard. (See Figure 7.)
4.
Disconnect the blower motor wire at the motor

flange.

5.
Remove the motor to case mounting screws and re-

move motor. Pry the flange gently if the sealer acts

as an adhesive.

6. Remove the blower wheel retaining nut and separate

blower and motor.

Installation

1.
Assemble the blower wheel to the motor with the

open end of the blower away from the motor.

2.
Place the assembly into the case and replace the

mounting screws. Connect the blower motor wire to

the motor.

3.
(Chevrolet and Camaro) Replace the fender and

skirt assembly.

(Chevelle) Replace the fender skirt.

4.
Clip the heater hoses to the fender skirt and connect

the battery ground cable.

CHEVROLET CHASSIS SERVICE MANUAL

ENGINE-ELECTRICAL 6Y-33

O

V-8 ENGINE
STARTING MOTOR

Fig.
2s—V-8 Starting Circuit Diagram

2.

3.
From battery negative post
To
starting motor

housing.

From solenoid battery terminal
To
solenoid motor

terminal.

If voltage drop
in
any
of
above check exceeds 0.2 volts,

excessive resistance
is
indicated in that portion
of
start-

ing circuit
and the
cause
of the
excessive resistance

should
be
located
and
corrected
in
order to obtain maxi-

mum efficiency in the circuit.

CAUTION:
Do not
operate
the
starting motor

continuously
for
more than
30
seconds
to
avoid

overheating.

When
the
solenoid fails
to
pull
in, the
trouble may be

due
to
excessive voltage drop in the solenoid control cir-

cuit.
To
check
for
this condition, close
the
starting

switch
and
measure
the
voltage drop between
the
BAT-

TERY terminal of the solenoid and the
SWITCH (S)
termi-

nal
of
the solenoid.
1.
If
this voltage drop exceeds 3.5 volts, excessive
re-

sistance
in the
solenoid control circuit
is
indicated

and should be corrected.

2.
If the
voltage drop does not exceed 3.5 volts and the

solenoid does not pull in, measure the voltage availa-

ble
at
the SWITCH terminal
of
the solenoid.

3.
If the
solenoid does
not
feel warm,
it
should pull
in

whenever the voltage available
at
the SWITCH termi-

nal
is 7.7
volts
or
more. When
the
solenoid feels

warm,
it
will require
a
somewhat higher voltage
to

pull in.

STARTING MOTOR AND SOLENOID CHECK

The following checks
may be
made
if the
specific

gravity of the battery
is
1.215
or
higher.

1.
If the
solenoid does
not
pull in, measure the voltage

between
the
switch
(S)
terminal
of the
solenoid
and

ground with the starting switch closed.

CAUTION:
If the
solenoid feels warm, allow
to

cool before checking.

If
the
voltage
is
less than 7.7 volts, check for ex-

cessive resistance
in the
solenoid control circuit.

If
the
voltage exceeds 7.7 volts, remove the starting

motor
and
check
(1)
solenoid current draw,
(2)

starting motor pinion clearance,
and (3)
freedom of

shift lever linkage.

2.
If
the solenoid "chatters" but does not hold in, check

the solenoid
for an
open "hold-in" 'winding. When-

ever
it is
necessary
to
replace
a
starting motor

solenoid, always check starting motor pinion

clearance.

3.
If
motor engages
but
does
not
crank
or
cranks

slowly, check
for
excessive resistance
in the ex-

ternal starting circuit, trouble within
the
starting

motor,
or
excessive engine resistance
to
cranking.

SERVICE OPERATIONS

STARTING MOTOR

REMOVAL AND INSTALLATION (Fig.
3s)

The following procedure
is a
general guide
for all

vehicles
and
will vary slightly depending
on
series
and

model.

1.
Disconnect battery ground cable at battery.

2.
Raise vehicle
to a
good working height.

3.
Disconnect all wires
at
solenoid terminals.

NOTE: Reinstall
the
nuts
as
each wire
is
dis-

connected
as
thread size
is
different but may be

mixed and stripped.

4.
Loosen starter front bracket (nut on V-8 and bolt on

L-6) then remove two mount bolts.

5.
Remove
the
front bracket bolt
or nut and
rotate

bracket clear
of
work area then lower starter from

vehicle
by
lowering front end first
—
(hold starter

against bell housing
and
sort
of
roll end-over-end).

6. Reverse
the
removal procedure
to
install. Torque

the mount bolts
to
25-35
ft.
lbs. first, then torque

brace bolt.

7.
Check operation
of
starter on vehicle.
Fig.
3s—Starter Mounting

CHEVROLET CHASSIS SERVICE MANUAL

ELECTRICAL-BODY AND CHASSIS 12-35

SERVICE OPERATIONS

INSTRUMENT CLUSTER

REMOVAL AND INSTALLATION (Fig. 49)

1.
Remove mast jacket assembly. Refer to Section 9

for removal procedures.

2.
Disconnect tachometer drive cable at distributor.

3.
Disconnect the headlamp panel control switch from

instrument cluster.

4.
Remove lighting switch as outlined in this section.

10 10-A 1112 13

14
15 16 17 18 19

Fig.
49- Instrument Cluster Connections

1.
Cluster Illuminating

Bulbs

2.
Direction Signal Indicator

Bulb L.H.

3. Direction Signal Indicator

BulbR.H.

4.
Headlamp Actuating Motor

Indicator

5. Headlamp Hi Beam

Indicator

6. Parking Brake Alarm

Indicator

7. Ground Lead Attaching

Point

8. Temperature Indicator
"1"

Terminal
9.

10.

10A.

11.

12.

13.

14.

]5.

16.

17.

18.

19.

20.

21.
Temperature Indicator "S"

Terminal

Ignition Switch Receptacle

ignition Switch Illuminating

Bulb

Oil Pressure Indicator

Tachometer

Lighter Receptacle

Trip Odometer

Wiper Switch Receptacle

Speedometer

Ammeter "Gen" Terminal

Ammeter "Battery" Terminal

Lighting Switch Receptacle

Fuel Gauge
"1"
Terminal

Fuel Gauge "S" Terminal

5. Remove the ignition switch. Refer to Section 6Y

for removal procedure. Then disconnect ignition

switch lamp support at instrument panel.

6. Disconnect oil pressure line at oil pressure gauge

then remove the lead wires from ammeter, wiper

switch and cigarette lighter. Disconnect trip odom-

eter at mast jacket support.

7. Remove the instrument cluster-to-dash retaining

screws and pull cluster assembly slightly forward

to obtain clearance for removal of speedometer

cable, tachometer cable, cluster ground wire, fuel

gauge lead wires and remaining indicator and cluster

illuminating lamps.

8. To install cluster in dash panel, reverse removal

procedure.

FUEL GAUGE

The gasoline fuel gauge circuit consists of an electri-
cal indicator in the instrument cluster and a float-

controlled rheostat in the fuel tank.

Since the fuel gauge consists of two remotely located

units and connecting wires, it is sometimes difficult to

determine which unit is at fault when the gauge fails to

operate properly. Cluster removal is necessary to re-

place the fuel gauge.

NOTE:
Be sure to check gas gauge fuse in fuse

panel before attempting to trouble shoot for

inoperative gauge or tank sending unit.

SPEEDOMETER AND/OR TACHOMETER

Removal and Installation

Cluster must be removed from vehicle to service

speedometer head assembly (see Cluster Removal pro-

cedure)
.
With cluster removed from vehicle:

1.
Remove five screws securing cluster back panel to

cluster assembly; separate the parts carefully.

CAUTION: Care must be used to avoid marring

instrument cluster face.

2.
Remove two screws securing speedometer or ta-

chometer head to cluster back panel; carefully re-

move speedometer or tachometer head.

NOTE:
Servicing of speedometer or tachom-

eter head should be performed by an authorized

AC service station.

3.
Reverse above procedure to install speedometer.

Cable Replacement or Lubrication

1.
Disconnect the. cable from the speedometer or ta-

chometer head. Remove the old cable by pulling it

out from speedometer end of conduit.

NOTE:
If old cable is broken it may be nec-

essary to remove lower piece from transmission

or distributor end of conduit as applicable.

2.
Lubricate the lower 3/4 of cable with
AC
speedom-

eter cable lubricant and push the cable into the con-

duit. Connect the upper end to the speedometer or

tachometer head and road test vehicle for proper

operation.

TEMPERATURE GAUGE

The temperature indicator requires very little service

other than testing for malfunctioning and replacing de-

fective units. Cluster must be removed to service tem-

perature gauge.

Do not attempt to repair either the engine unit or the

gauge. When installing new engine unit, do not use

thread compound on unit threads, as this will increase

electrical resistance of unit and cause faulty reading

on gauge.

AMMETER OR OIL PRESSURE GAUGE

The ammeter or oil pressure gauge requires very

little attention other than keeping ammeter terminals

clean and tight. If the oil pressure control line should

become restricted it should be blown out or replaced.

Cluster must be removed to service these gauges.

HftVKI MANUAL

ELECTRICAL-BODY AND CHASSIS 12-43

23.
Install
MCtT
ring over steering shaft using snap ring

installer J-22659 (refer to Section 9).

NOTE: Be sure retaining ring is completely

seated into groove.

24.
Install dial pointer on Chevrolet and Chevelle models

equipped with automatic transmission (if applicable).

25.
Install dial indicator and lamp assembly on Camaro

and Chevy n models equipped with automatic

transmission.

26.
Install mast jacket lower trim covers (if applicable).

27.
Install hazard warning knob and turn signal lever.

28.
Install shift lever.

29.
Install steering wheel.

30.
Install multiple connector to switch wiring using old

harness for wire color guide and connect to body

harness connector.

31.
Connect battery ground cable and check operation of

assembly.

Tilt Steering Column (Fig. 57)

Chevrolet, Chevelle and Camaro

1.
Disconnect battery ground cable.

2.
Disconnect directional switch wiring harness from

body harness at multiple connector under instrument

panel.

3.
Remove steering wheel assembly (refer to Steering,

Section 9).

4.
Remove preload spring and cancelling cam from end

of shaft.

5.
Remove shift lever pin and lever from steering col-

umn (except floor shift).

6. Remove directional le*ver screw and lever.

7.
Push in hazard warning knob and unscrew knob.

8. On Camaro models equipped with automatic trans-

mission, remove quadrant dial and lamp assembly

from column.

9. Remove mast jacket trim cover
(s).

10.
On Chevrolet and Chevelle models with automatic

transmission, loosen set screw and remove quadrant

dial pointer.

11.
Assemble slide hammer Tool J-6585-1 to turn signal

cover remover Tool J-21486. Place cover remover

over turn signal cover, tighten clamp, and pull cover

from end of column with slide hammer (Refer to

Steering, Section 9).

12.
Remove three switch mounting screws, noting short

length of top screw.

13.
Cut multiple connector from switch wiring and slide

switch from end of column.

14.
To install new switch, feed wiring through the bear-

ing housing, around support, and through shift bowl

and shroud.

15.
Feed through wiring protector. If clearance is not

sufficient loosen mast jacket bracket retaining bolts.

16.
Insert switch wiring terminals in multiple connector.

Use old connector
and
wiring for color guide.
17.
Position switch and install three mounting screws

with short screw in top position.

18.
Be sure hazard warning switch is pushed in, then

install turn signal cover using special Tool J-21853.

On automatic columns align key in cover with keyway

in bearing housing.

19.
Install turn signal lever, hazard warning knob and

tilt lever.

20.
Install shift lever and roll pin (where applicable).

21.
Install dial pointer on Chevrolet and Chevelle. On

Camaro install dial indicator and lamp assembly.

22.
Install trim covers and retaining screws.

23.
Install cancelling cam and preload spring.

24.
Install steering wheel (Refer to Section 9).

25.
Connect switch wiring to body harness under instru-

ment panel.

26.
Connect battery ground cable and check operation of

unit.

Standard and Telescoping Steering Column

Corvette (Fig. 58)

1.
Disconnect battery ground cable.

2.
Disconnect signal switch harness wiring from chas-

sis wiring harness at multiple connector under in-

strument panel.

3.
Remove steering wheel assembly as outlined in

Steering, Section 9.

4.
Remove preload spring and cancelling cam.

5.
Remove directional signal lever screw and lever.

6. Push in hazard warning knob, unscrew and remove

knob.

7.
Remove lower trim cover retaining screws and

cover.

8. Remove retaining ring, thrust and wave washers

from upper end of shaft.

9. Cut wiring above connector.

10.
Remove three switch mounting screws, slide switch,

cover and upper bearing housing from column, pull-

ing wire through protector and escutcheon.

11.
To install replacement switch, assemble upper bear-

ing housing and turn signal switch into switch cover,

then feed wiring through escutcheon and protector

until switch can be positioned on mast jacket.

12.
With switch positioned on mast jacket, install three

switch mounting screws.

13.
Install thrust and wave washers and snap lock ring

in place.

14.
Install turn signal lever and hazard warning knob.

15.
Install cancelling cam and upper bearing preload

spring on steering shaft.

16.
Install steering wheel assembly.

NOTE:
Be sure directional signal switch is in

neutral position before installing wheel.

17.
Install connector on directional signal wiring har-

ness and connect to body harness connector.

CHEVROLET CHASSIS SERVICE