1967 CHEVROLET CAMARO heater

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-72

Fig.
103—Comforrron Underhood Vacuum Lines

Fig.
104—Comfortron Underdash Vacuum Lines

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-74

Fig.
108—Comfortron Power Servo Installation

4.
Disconnect heater' hoses from heater core (at

firewall).

5. Remove glove box door.

6. Remove glove box interior.

7. Disconnect right, left, and center air conditioning

outlet hoses from distributor duct.

8. Remove air distributor duct from heater

housing.

9. Disconnect hose and cable clamps from heater

housing.

10.
Remove the remaining three heater housing stud

retaining nuts (engine compartment) and one upper

retaining screw (inside vehicle).

11.
Pull the unit away from the firewall and out of the

car.

ADJUSTMENT

SCREW

Fig.
109—Mode Shift Vacuum Diaphragm
Fig. 110'—Compressor Mount—L-6 Engines (Typical)

12.
Remove heater.housing cover from heater housing.

13.
Remove heater core from heater housing cover by

removing four (4) retaining screws and two "U"

clamps.

14.
Remove heater core.

Installation

1.
Replace core in case using a non hardening sealer.

Attach the core clamps and retaining screws.

2.
Attach the heater housing cover to the housing.

3.
Position the unit against the firewall and attach

it with the retaining screw at the top of the case.

4.
Attach the sheet metal nuts to the case studs which

project through the firewall to the engine side.

5. Connect the control cables to the control doors and

case.

6. Attach the air distributor duct to the case.

7. Connect the left, right, and center outlet hoses.

8. Replace the glove box assembly.

9. Connect heater hoses to core tubes.

10.
Replace fender assembly.

11.
Fill cooling system and connect battery cable.

Camaro

Lower Heater Hose

Removal

1.
Drain radiator.

2.
Remove side mouldings and retainers.

3.
Remove lower fender attaching bolts.

4.
Remove skirt to fender and skirt to reinforcement

bolts.

5. pry the skirt away from the fender flange and away

from the firewall. Block the skirt (four inchlengtti

of 2 x 4) clear of the lower hose and proceed with

the hose replacement.

Installation

1.
Connect the hose.

2.
Remove the block, move the skirt into position and

install all attaching bolts.

3.
Replace fender attaching bolts and mouldings.

4.
Refill cooling system.

CHEVROLET CHASSIS SERVICE MANUAL

HEATER AND AIR CONDITIONING 1A-75

283-327 V-8

CHEVROLET, CHEVELLE AND CAMARO

396-427 V-8

CHEVROLET AND CHEVELLE

283-327 V-8

CHEVY II

Fig.
Ill—Compressor Mount—V-8 Engines

COMFORTRON HEATER COMPONENTS

Heater Core

Removal

1.
Remove the core case as previously described under

Heater and Air Distributor Assembly.

2.
Remove the screws attaching the die cast plate to

the air inlet side of the case. Disconnect the tem-

perature door linkage at the door shaft.
3.
Remove the die cast plate with core from the case.

Remove the core mounting screws and remove core.

Installation

1.
Seal the core to the cast plate with non-hardening

sealer and attach the core with the mounting straps

and screws.

2.
Install the plate to the case and connect the tem-

perature door linkage.

CHEVROLET CHASSIS SERVICE MANUAL

HEATER AND AIR CONDITIONING 1A-76

Fig.
112—-Heater Core Removal—Four-Season System (Corvette)

3.
Replace the core case into the car as described

under Heater and Air Distributor Assembly.

COMPRESSOR

The same basic six.cylinder reciprocating compressor

is used in all systems.

Two variations of the basic compressor are used. One,

with a displacement of 12.6 cu. in. is used with the Four-

Season System. The second model, having displacement

of 10.8 cu. in. is used with the Universal and All-Weather

Systems.
AH Systems

Removal

1.
Purge the refrigerant from the system.

2.
Remove connector attaching bolt and connector. Seal

connector outlets.

3.
Disconnect electrical lead to clutch actuating coil.

4.
Loosen brace and pivot bolts and detach belt.

5. Remove the nuts and bolts attaching the compressor

brackets to the mounting bracket.

6. Before beginning any compressor disassembly, drain

and measure oil in the compressor. Check for

evidence of contamination to ..determine if remainder

of system requires servicing. Compressor Servicing

information is located in the Chassis Overhaul

Manual.

Installation

1.
li oil previously drained from the compressor upon

removal shows no evidence of contamination, replace

a like amount of fresh refrigeration oil into the com-

pressor before reinstallatLon. If it was necessary to

service the entire system because of excessive con-

tamination in the oil removed, install a full charge of

"fresh refrigeration oil in the compressor. (See

Checking Compressor Oil Charge under Checking

Oil)

2.
Position compressor on the mounting bracket and

install all nuts, bolts and lock washers.

3.
Install the connector assembly to the compressor

rear head, using new "O" rings.

4.
Connect the electrical lead to the coil and install

and adjust compressor belt.

5. Evacuate and charge the system.

6. Leak test the system and check for proper operation.

Fig.
113—Heater Hoses^-Four-Season System (Corvette)

CHEVROLET CHASSIS SERVICE MANUAL

HEATER AND AIR CONDITIONING 1A-77

Compressor Belt Tension Adjustment

Adjust the compressor belt to the specifications shown

in the Tune-Up chart in the Engine section of this manual.

COMPRESSOR FAILURE

If the compressor has failed mechanically to the ex-
tent that metal chips and shavings are found in it, the

system should be checked for foreign material and

cleaned as described under Foreign Material in the

System.

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