relay CHEVROLET CAMARO 1967 1.G Chassis User Guide

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

HEATER AND AIR CONDITIONING 1A-73

Fig.
105—Comfortron Control Head

10.
Introduce R-12 vapor at cylinder (room) temperature

and pressure.

11.
Leak test all fittings and connections and give partic-

ular attention to a leak test at the compressor shaft

seal if compressor has not been leak tested on the

bench.

12.
Complete system processing and charge system.

FUSES

A fuse, located in the junction block protects the entire

air conditioning system except for the blower when op-

erating at high speed.

A second fuse, to protect the high speed blower circuit,

is located in the electrical wiring between the horn relay

and the Air Conditioner relay (except Universal). The
Universal unit has a fuse in the line between the ignition

switch and the Air Conditioner blower switch. See the

specification page for the proper replacement fuse.

FOUR SEASON HEATER COMPONENTS

Corvette

The heater components of the system are, in general,

much the same as those of the standard Corvette heater.

Heater hoses carry the engine coolant to the heater core,

located in the air distributor duct beneath the instrument

panel.

A significant difference is that in the Corvette Air

Conditioning System there is no flow through the heater

core until the COOL IN-HOT PULL knob is pulled out.

This movement opens the vacuum switch on the air

distributor assembly and allows vacuum to be applied

to the water valve mounted in the engine compartment,

opening the valve. Thus the heater core is unheated

until needed, at which time it receives full flow of the

engine coolant. Air passing through the core receives

maximum heat which is tempered by mixing with un-

heated air before entering the passenger compartment.

Heater Core

Replacement

The heater core in the Corvette Air Conditioning

System is removed in the same manner as the core in

the Corvette heater. The distributor assembly must first

be removed from under the dash as covered previously

in this section before the core can be removed and

replaced.

Water Valve

Installation of the water valve is illustrated in Figure

113.
An inoperative valve must be replaced.

Chevrolet

Heater Core

Removal

1.
Disconnect battery ground cable.

2.
Drain radiator

3.
Remove right front fender and skirt assembly.

Fig.
106—Comfortron Temperature Dial Adjustment
Fig.
107—Amplifier Removal

CHEVROLET CHASSIS SERVICE MANUAL

HEATER AND AIR CONDITIONING 1A-78

WIRING DIAGRAMS

Blower

Motor

Resistor
•

Asm

EVAPORATOR—v

ASM.
\

-Diode
(Arc I

suppressor)
^\

16B
—>

-COMPRESSOR

Clutch Coil

•To battery positive

(+) terminal
No vacuum

in hose
#3

Blower

intake

air

Outside

air entry

Valve

by vacuum
in

hose
#3
Valve

normally

closed (spring

held)

Inside

car
air

(Recirc.)
AIR INLET

VALVE

POSITION:

Outside
air
intake

Recirc. air'intake

CONTROL ASM

TEMP CONTROL LEVER

(Operates temp valve

cable
&
equipment
in

chart shown below)
Compressor
Sw.

(Normally closed

Temp valve

begins
to
open

valveV

cable
arm

•Fan Speed Selector Switch

Switch

lever

position

Off

Low

Med

High
Contacts

made

B
to
None

BtoL

B to L
&
M

B to
L
& H
Fan

speed

Low

Low

Med

High
Resistance

in series with

Bio Motor

Hi

Rl

(RiR2)/(Rl+R2)

None

•Blower switch contacts must
be
dosed

before
fan
switch will
be
operable.
COLD
(O.
A.)

COLD a.A.)

Blower

H
y—low
switch

M/
-med
(Norm,

closed

contacts)

Fan speed switch

(See chart
at
left)

To vacuum,

tank

EXTENSION—vy

Horn relay "Bat" WIRE
ASM
X
harness

terminal

V
.**-__.. ;_
1 I panel

Legend:

___. —
Production wiring

Wire
is
part
of
equip.

•—————* Air
conditioning
wrg.
| i

T Agn. sw.

accsy

I term.

I
Temp

Control

Lever

Position

OFF

VENT.

COLD(I.A.)

COLEKO.AJ

HOT
Blower

(Master)

switch

contacts

Open

Closed

Closed

Closed

Closed
Vac switch

connects

vac source

to hose
#

#2

#2
&
#3

None

#3

#2
&
#3
Compressor

switch

contacts:

Open

Open

Closed

Closed

Open
Blower

intake
air

Outside
car air

intake used

Inside
car air

recirculated

Outside
car air

intake used

.Outside
car air

intake used

Fig. 114—Chevrolet—Four-Season Wiring Diagram

CHEVROLET CHASSIS SERVICE MANUAL

HEATER
AND AIR CONDITIONING IA-79

BAT.
CABLE

ASM

A/C
wrg fwd of
dash

exc
bat.
cables,
ext
wire
&

compressor
grd
wire
is
part

of engine wiring harness.

"COMPRESSOR"
SW:

"OFF" POSN

"ON"
POSN
RELAY

ASM

/-DASH

/
PANEL

RESISTOR

ASM

LUTCH

COIL

:OMI

GRD
WIRE
ASM
MPRESSOR

BAT.
TERM

ON START

MTR SOL

EXTENSION WIRE ASM

._
J

J
^-CONTROL
SW

CONTACTS

B TO NONE

BTOL

BTOL&M

BTOL6H

•IGN SW ACCSY TERM.

A/C wrg
to
rear
of
dash

of
inst pnl harness.

Fig.
115—CheveIle—Four-Season Wiring Diagram

CHEVROLET
CHASSIS SERVICE MANUAL

HEATER
AND AIR
CONDITIONING
1A-80

EVAPORATOR ASM.

Blower

Motor
INSIDE VALVE

(Normally closed

-spring held)

PLENUM VALVE

(Normally open

-spring held)
Actuator

(Vacuum

operated)

Inside car air (Recirc*

CONTROL ASM

TEMP CONTROL LEVER

•(Operates temp valve

cable
&
equipment in

hart shown below)

Temp valve

begins to

16DG

Fuse (In-line^

COMPRESSOR

Clutch Coil DASH-

PANEL

•Fan Speed Selector Switch

Switch

lever

position

Off

Low

"HeST

High
Contacts

B to
None

BtoL

B to L b U

BtoL&H
Fan

speed

Low

Low

Med

High
Resistance

in series with

Bio Motor

Rl

Rl

RlR2)/(Rl+R2)

None

•Blower switch contacts must be closed

before fan switch will be operable.

-To battery positive

(-0 terminal

•
Horn relay

terminal"
"Batf
To vacuum

tank

EXTENSION

WIRE
ASM
(Normally closed

contacts-*vac

operated)

7
*- Fan speed switch

(See chart at left)

•/-Wire is

\ part of

I inst panel

harness

Legend:

— Production wiring

————
Wire Is part of equip.

•mmmmmmmmmmmmmm*
AIT
Conditioning
WTg*
Temp

Control

Lever

Position

OFF

VENT

COLD

a.A.)

COLD

(O.A.)

HOT
Blower

(Master)

switch

contacts

Open

Closed

Closed

Closed

Closed
Vac switch

connects

vac source

to hose #

#2
&
#3

#2

#3

None

#2
Compressor

switch

contacts^

Open

Open

Closed

Closed

Open
Blower

intake air

Outside car air

intake used

Inside car air

recir culated

Outside car air

intake used

Outside car air

intake used

Fig.
116—Camaro—Four-Season Wiring Diagram

CHEVROLET CHASSIS SERVICE

HEATER AND AIR CONDITIONING 1A-81

HORN RELAY

r

CONN.-

14 BROWN

(TO FUSE

PANEL)
BATTERY
1

—I ^ COMPR

ESSOR

DASH y

V-^ PANEL \

GROMMET—%
1 \

_ J~ ") "^

>14 BLACK/RED STRIPE-

FUSE .20 AMP.

•WIRE ASM. BLOWER-

MOTOR
14 BLACK 1

IGNITION SWITCH1

(ACCESSORY

TERMINAL)

CONTROL SWITCH
-RESISTOR

CONN.

•14 TAN

•16 BLACK

LIGHT BLUE STRIPE

•THERMOSTAT CONTROL

EVAPORATOR & BLOWER ASM.

Fig.
117—Universal System Wiring Diagram (Typical)

CHEVROLET CHASSI

HEATER AND AIR CONDITIONING 1A-82

•BATTERY

(POS)
CABLE
NOTE
When
control
switch*

is !TOFF"
&
Air
Cond
is
"ON"

(Control
knob
pulled
but) the

blower
fan'will
run at low
speed.
CONTROL
SWITCH

CONNECTIONS

OFF

LOW

MED

HIGH
B
TO
NONE

B
TO L

BTOL&M

B
TO L
&
H

COMPRESSOR
GROUND

WIRE
ASM
BATTERY

(NEGATIVE)

CABLE

COMPRESSOR
ASM

DASHPAJSTEL

GROMMET

16DG
CONTROL

SWITCH

RESISTOR

ASM

14LBL

14BRN
CLUTCH

COIL

EXTENSION

WIRE
ASM
-14BRN--N

JUNC

BLOCKi

OSTATIC

SWITCH

CONTACTS

NORMALLY

CLOSED
STARTING

MOTOR

SOLENOID

BLOWER

MOTOR
AIR
COND

CONTROL

(PUSH-PULL)

KNOB

DOOR
SWITCH

(PUSH
BUTTON

NORMALLY

CLOSED)
RELAY

ASM

HORN

RELAY

DIVERTER

DOOR CABLE

FUSE

PANEL

EVAPORATOR

ASM

IGNITION SWITCH-

ACCESSORY TERMINAL)

Fig. 118—All Weather Wiring Diagram (Chevy II)

CHEVROLET CHASSIS SERVICE MANUAL

HEATER AND AIR CONDITIONING 1A-83

DIVERTER DOOR

CRANK POSITIONS:

AIR COND "ON"

AIR COND "OFF*
AIR COND SWITCH

(PUSH BUTTON,

NORMALLY CLOSED

CONTACTS)

BLOWER MOTOR

CONTACTS

NORMALLY

4D

16

16B/Y

COMPRESSOR

GROUND WIRE

ASM

BAT.
TERMINAL

ON STARTING

MOTOR SOLENOID

' BATTERY

CABLE ASM:

NEGATIVE

POSITIVE—*
- CONTROL SWITCH

SET AT:

•OFF

LOW

MED

HIGH
CONTACTS:

BTOBL

BTOL

BTOM

BT0M6B,

CLUTCH

HOUSING
liOli: WHEN CONTROL

SWITCH IS AT "OFF" &

AIR COND. IS "ON", FAN

WILL RUN AT LOW SPEED.

"AIR COND-PULL"

KNOB (SHOWN IN "ON"

POSITION)

TO REGULATOR

HORN

RELAY
16 BRN-BODY WIRING

HARNESS-837

14BRN

I

^
IA^RN
* IGNITION SWITCH

« 12R ACCESSORY TERMINAL

12R f

AMMETER

LEGEND:

AIR COND WIRING (PART OF

ENGINE WIRING HARNESS)

WIRING IS PART OF EQUIP

REG PRODUCTION WIRING

Fig.
119—Corvette—Four-Season Wiring Diagram

CHEVROLET CHASSIS SERVICE MANUAL

ENGINE-ELECTRICAL 6Y-7

CHARGING SYSTEM

INDEX

Page

General Description . 6Y-7

Maintenance and Adjustments 6Y-9

Static Checks . 6Y-10

System Condition Check and Voltage

•Regular Adjustment. 6Y-10

General Output 6Y-11

Generator Diode and Field Test 6Y-12

Indicator Lamp-Initial Field Excitation

Circuit Tests . 6Y-12
Page

Field Circuit Resistance Wire Tests 6Y-13

Field Relay Test and Adjustment 6Y-14

Other Harness Checks 6Y-14

Service Operations 6Y-14

Generator 6Y-14

Removal and Installation 6Y-14

Pulley Replacement. 6Y-14

Brush Replacement (6" Delcotron). 6Y-15

Double Contact Regulator . . . . . . 6Y-16

GENERAL DESCRIPTION

The charging system includes the battery, generator,

regulator, telltale light, and necessary wiring to connect

these components. The Delcotron is offered as standard

equipment, although there are various capacities avail-

able on all models.

The Delcotron continuous output A.C. generator (fig.

lc) consists of two major parts, a stator and a rotor. The

stator is composed of a large number of windings as-

sembled on the inside of a laminated core that is attached

to the generator frame. The rotor revolves within the

stator on bearings located in each end frame. Two

brushes are required to carry current through the two

slip rings to the field coils wound concentric with the

shaft of the rotor. Six rectifier diodes are mounted in the

slip ring end frame and are joined to the stator windings

at three internally located terminals.

Diodes are mounted in heat sinks to provide adequate

heat dissipation. The six diodes replace the separately
mounted rectifier as used in other types of application.

The diodes change the Delcotron A.C. current to D.C.

current.

Two regulators (fig. 2c) are available on the 1967 vehi-

cles,
a double contact two unit type and a transistor

regulator. The function of these regulators in the charg-

ing system is to limit the generator voltage to a pre-set

value by controlling the generator field current. Both

regulators have an internal field relay unit. The relay

unit allows the telltale lamp to light (as a bulb check)

with the ignition key on and engine not running. When the

engine is started and the generator begins to charge, the

indicator light goes out indicating that the system is op-

erating normally.

The double contact regulator, when used with the

special 63 amp air conditioning model generator (4 ohm

field coil) uses a field discharge diode internally in the

field circuit (figs. 3c and 4c). The added diode adapts the

BRUSH AND

TERMINAL

ASSEMBLY

SLIP RINGS
SLIP RING

END FRAME

_\

THRU

BOLT
DRIVE END

FRAME

BEARING

BEARING

DIODES

ROTOR

5.5" SERIES ID DELCOTRON
STATOR

ASSEMBLY
GREASE

RESERVOIR

BRUSH

FAN ASSEMBLY

6.2" SERIES 2D TYPE 150 DELCOTRON

Fig.
lc—Delcotron Cross-section View

CHEVROLET CHASSIS SERVICE MANUAL