radiator CHEVROLET CAMARO 1967 1.G Chassis User Guide

HEATER AND AIR CONDITIONING 1A-47

are certain procedures, practices and precautions that

should be followed to prevent costly repairs, personal

injury or damage to equipment. For this reason it is

strongly recommended that the preceding information in

this section be studied thoroughly before attempting to

service the sytem.

Great emphasis must be placed upon keeping the sys-

tem clean. Use plugs or caps to close system components

and hoses when they are opened to the atmosphere. Keep

your work area clean.

In removing and replacing any part which requires

unsealing the refrigerant circuit the following operations,

which are described in this section, must be performed

in the sequence shown.

1.
Purge the system by releasing the refrigerant to the

atmosphere.

2.
Remove and replace the defective part.

3.
Evacuate and charge the system with R-12.

CAUTION: Always wear protective goggles

when working on refrigeration systems. Goggles

J-5453 are included in the set of air conditioning

special tools. Also, beware of the danger of

carbon monoxide fumes by avoiding running the

engine in closed or improperly ventilated

garages.

FOREIGN MATERIAL IN THE SYSTEM

Whenever foreign material is found in the system,

it must be removed before restoring the system to

operation.

In the case of compressor mechanical failure, perform

the following operations:

1.
Remove the compressor.

2.
Remove the receiver-dehydrator and discard me

unit.

3.
Flush the condenser to remove foreign material

which has been pumped into it.

4.
Disconnect the line from the receiver-dehydrator

at the inlet connection of the expansion valve. Inspect

the inlet screen for the presence of metal chips

or other foreign material. If the screen is plugged,

replace it. Reconnect the line to the expansion

valve.

5. Install a new receiver dehydrator.

6. Install the replacement compressor.

7. Add the necessary quantity of oil to the system (one

fluid ounce because of receiver-dehydrator replace-

ment plus the quantity needed for the replacement

compressor—see Checking Compressor Oil Charge

under Checking Oil.

8. Evacuate and charge the system.

9. Check system performance.

CONDENSER

Chevrolet

Replacement

1.
Remove the hood catch and hood catch - grille

support.

2.
With the system purged of refrigerant, disconnect

the inlet and outlet hose clamp connections and the

condenser to radiator support attaching screws.

3.
Remove the condenser from the vehicle.
NOTE:
If it is to be reused, cap or tape the

receiver-dehydrator inlet and outlet connections

at once.

4.
Install new condenser, position the assembly and

install the radiator support to condenser attaching

screws and replace all line connections.

5. Replace the hood catch and grille support and its

attaching bolts.

6. Replace the hood catch.

7. Evacuate, charge and check the system. Add one

fluid oz. refrigerant oil after installing a new

condenser.

Chevelle and Camaro

Replacement

1.
Remove the hood lock catch support and catch.

2.
With the system purged of refrigerant, disconnect

the inlet and outlet hose clamp connections and the

condenser to radiator support attaching screws.

3.
Remove the condenser from the vehicle.

NOTE:
Cap or tape the inlet and outlet con-

nections at once.

4.
Install new condenser, position the assembly and in-

stall the radiator support to condenser attaching

screws and replace all line connections.

5. Evacuate, charge and check the system. Add one

fluid oz. refrigerant oil after installing a new

condenser.

Chevy II

Replacement

1.
Purge the refrigerant from the system.

Fig.
59—Condenser Mounting (Chevrolet and Chevelle)

CHEVROLET CHASSIS SERVICE MANUAL

HEATER AND AIR CONDITIONING 1A-48

Fig.
60-Condenser Mounting (Chevy II)

2.
Remove the bumper, bumper filler panel, grille,

grille support, hood lock catch support and catch as

described in Section 11, "Chassis Sheet Metal".

3.
Disconnect connectors at condenser inlet and outlet

tubes and remove screws attaching refrigerant line

holding clips to the condenser baffle.

4.
Remove bolts attaching condenser through radiator

' support and slide condenser to the left and out of

vehicle.

5. Reverse these steps to reinstall new condenser.

6. Evacuate and charge the system. Add one fluid oz.

of refrigerant oil after installing a new condenser.

Corvette

Replacement (Production Engine)

1.
Remove the hood from the car, first scribing the

hinge attachment location.

2.
Purge the system of refrigerant.

Fig.
61—Condenser Mounting (Cdrnaro)
Fig.
62—Condenser Mounting (Corvette)

3.
Disconnect the inlet line connection at the condenser

inlet and the outlet line at the receiver-dehydrator.

Cap the receiver-dehydrator immediately.

4.
Remove the screws attaching the condenser to the

radiator support and carefully lift the unit from the

car.

5. Remove the receiver-dehydrator from the old con-

denser and install it, using a new "O" ring, on the

new condenser.

6. Set new condenser in place on the radiator support

and install the attaching screws, torquing them to

20 lbs. ft.

7. Make the inlet and outlet connections, using new

"O"
rings, and torque 13 lbs. ft.

8. Evacuate, charge and check the system. Add one

fluid oz. of refrigerant oil after installing a new

condenser.

Replacement (Optional Engine)

Replacement procedure remains much the same for the

installation supplied with the optional engine except for

the location of the receiver-dehydrator. Follow the steps

given above except that the outlet line must be removed

at the receiver outlet. (See Figure 64.)

RECEIVER-DEHYDRATOR

The receiver-dehydrator should be replaced if it has

been damaged through an accident or if it leaks or be-

comes restricted or clogged. Do not attempt to repair

the receiver-dehydrator.

The receiver-dehydrator is merely a moisture collect-

ing device and a refrigerant storage area and is the least

likely component of the system to cause a malfunction.

If at any time when examining the compressor oil,

moisture is found or there is an indication of moisture

at the expansion valve needle, the receiver-dehydrator

should be replaced as follows (fig. 63):

NOTE:
If the receiver-dehydrator is to be re-

used, cap the inlet and outlet connections

immediately. When installing a receiver-

dehydrator, do not uncap the connections until

CHEVROLET CHASSIS SERVICE MANUAL

HEATER AND AIR CONDITIONING 1A-49

CHEVROLET

CHEVELLE

CHEVY II

CAMARO
the last possible moment. Be certain that the

direction of flow is correct before connecting

the pipes.

Chevrolet, Chevelle, Chevy II, and Camaro

Replacement

1.
Remove the receiver inlet and outlet connections and

the two receiver to fender skirt attaching screws.

2.
Carefully remove the receiver-dehydrator from the

vehicle.

3.
Replace the new receiver~dehydrator assembly in

the vehicle and install all attaching screws and re-

frigerant lines.

4.
Add one fluid oz. refrigerant oil, evacuate and charge

the system.

Corvette

Replacement

1.
Purge the system of refrigerant.

2.
Disconnect the "O" ring inlet

hose clamp outlet connection

openings.

3.
Remove the receiver-dehydrator to radiator support

bracket screws (production engine) or receiver-

dehydrator to condenser bracket screws (optional

engine) and remove the unit from the car.

4.
Install the new receiver-dehydrator applying 30 in.

lbs.
torque to the attaching screws.
connection and the

and tape the hose

NOTE:
Do not uncap the new receiver-

dehydrator until the last instant before

installation.

5.

2.

3.

Fig.
63—
Receiver-Dehydrator Mounting (Chevrolet,

Chevelle/ Chevy II, Camaro)
Connect the high pressure lines at the inlet (use a

new "O" ring and torque connection to 13 ft. lbs.)

and outlet (torque screw to 25 in. lbs.).

6. Add one fluid oz. refrigerant oil, evacuate, charge

and check the system.

Sight Glass Replacement-All Vehicles

If damage to the sight glass should occur, a new sight

glass kit should be installed. The kit contains the sight

glass,
seal and retainer. (See Figure 65.)

1.
Purge system.

Remove the sight glass retainer nut using a screw

driver and remove old glass and seal.

Install the new glass and seal and retainer nut, being

careful not to turn the nut past the face of the hous-

ing. To do so may damage the "O" ring seal.

4.
Evacuate and recharge the system.

EVAPORATOR

Chevrolet and Camaro Four-Season System

The evaporator and blower case assembly is designed

so that the core may be removed without the need for

removing the entire unit from the vehicle. Instead,

only the side cover must be removed.

Removal and Installation of Entire Assembly

1.
Remove the inlet line at the expansion valve and the

suction throttling valve outlet connection.

2.
Remove the electrical connector from the blower

motor.

CHEVROLET CHASSIS SERVICE MANUAL

HEATER AND AIR CONDITIONING 1A-56

BLACK & RED

IGNITION—-y^****

SWITCH -"A

/<J 7

BLOWER LEAD—^^^

RESISTOR—-" \^<

ASM.
f'

i
'fu^^^^A^^^^^r"G^OUH£>
WIRE

^^
k4

^EVAPORATOR HARNESS

' EVAPORATOR & BLOWER ASM.

Fig.
73—Underdash Wiring—Universal System (Typical)

evaporator outlet pipes. Locate the bracket about

1/2" from the dash panel.

12.
Replace the inlet and outlet hoses and hose clamp

connections.

13.
Evacuate and charge the system. Add three fluid oz.

refrigerent oil after installing a new core.

14.
Check system performance.

Corvette

Replacement (Fig. 78)

1.
Purge the system of refrigerant.

2.
Drain the engine radiator. Then remove the radiator

supply tank from its brackets, the heater water

valve and vacuum line from the firewall, and the

heater hoses from the core pipes. Carefully fold the

hoses,
valve and tank away from the evaporator

case.

3.
Remove the right hand hood lock support.
SCREW DRIVER

(NARROW BLADE) T£

GROOVE

A. Insert screw driver in

tang toward terminal

B. Pry tang back out to

when reinstalled into
RMINAL

\ CONNECTOR

TANG

groove & press

to release.

insure locking

connector.

Fig.
74—Terminal Removal—Universal System

4.
Disconnect the expansion valve equalizer line con-

nection and the evaporator oil bleed line from the

POA.

5.
Disconnect the evaporator outlet to POA inlet

connector.

6. Remove the POA bracket to evaporator case attach-

ing bolts. Then carefully move the valve and its

outlet hose away from the evaporator case.

Fig.
75-Cable Removal-All Weather

CHEVROLET CHASSIS SERVICE MANUAL

HEATER AND AIR CONDITIONING 1A-57

EVAPORATOR PIPES

DISTRIBUTOR RELAY GRD.

ASSEMBLY & WASHER

EVAPORATOR ASM.
BLOWER

SHROUD

(RACKET

(PART OF

BLOWER)

Fig.
76—Evaporator Removal—All Weather

7. Disconnect the thermostatic expansion valve to evap-

orator inlet connector, remove the power element

bulb from the evaporator outlet line and carefully

move .the valve and its inlet hose away from the

evaporator case.

8. Remove the electrical connectors from the relay

and resistor terminals.

9. Remove the screws attaching the evaporator case

cover to the case. See Fig. 79. The core is bracket

mounted to the cover and the entire core and cover

assembly may now be removed from the vehicle.

10.
Remove the two cover to core bracket screws and

separate the core from the cover.

11.
Install the new core to the cover being sure that the

grommets are properly installed around the inlet

and outlet lines.

12.
Reinstall the core and cover assembly into the evap-

orator case and replace the attaching screws.
13.
Reinstall the STV and expansion valves, the equal-

izer line connection and the evaporator oil bleed line

from the STV.

NOTE:
Use all new «O" rings.

14.
Reinstall the radiator supply tank, water valve and

vacuum line, and replace the heater hoses onto the

core pipes being sure not to switch the hoses. Then

refill the radiator.

15.
Add three fluid oz. refrigerant oil after installing a

new core, evacuate and charge the system.

EXPANSION VALVE

The thermostatic expansion valve is factory adjusted

and pre-set and cannot be adjusted after installation. A

malfunctioning valve must be replaced. However, before

proceeding, check all other possible causes of the trouble.

Make certain that the power element bulb is properly

CHEVROLET CHASSIS SERVICE MANUAL

HEATER AND AIR CONDITIONING 1A-62

2.
Insert the evaporator assembly into the outlet case

half and mount the evaporator, thermostatic switch,

and cable to the case.

3.
Install the face plate to the case and install control

retaining nuts and knobs.

4.
Assemble the case halves and mount the evaporator

pipe clamp.

5. Install the evaporator assembly as previously

described under EVAPORATOR.

BLOWER ASSEMBLY

Four-Season System

Chevrolet and Camaro

Removal

1.
Disconnect battery ground cable.

2.
Remove the right front fender and skirt assembly.

3.
Disconnect the motor wire at the flange connector.

4.
Disconnect the rubber air cooling tube from the

motor.

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

move the blower assembly. If the sealer acts as an

adhesive, pry the assembly carefully away from the

6. Remove the blower from the motor shaft.

Fig.
86—Blower Assembly—Four-Season (Chevrolet,

Chevelle, Camaro)
Installation

1.
Mount the blower to the motor shaft with the open end

of the blower away from the motor.

2.
Mount the assembly to the case with the attaching

screws.

3.
Connect the rubber tube and blower wire to the

motor.

4.
Replace the right front fender and skirt assembly.

5. Connect battery ground cable.

Chevelle

The blower assembly (fig. 86) is mounted to the dash

panel and contains the outside air-recirculated air

diverter door, the heating-cooling diverter door, the air

conditioning relay and resistor, the compressor actuating

switch, and the blower motor.

Replacement

1.
Disconnect the blower motor "hot" wire at the con-

nector and the ground lead on the Chevrolet.

2.
Detach the rubber cooling tube from the blower as-

sembly and remove the five bolts attaching the

blower motor to the blower assembly.

3.
Remove the motor and fan, disassemble fan from

motor and install on a new motor. If, because of

engine accessories, hoses restrict lifting the blower

assembly from the engine compartment, remove

blower from motor and lift units out separately.

Assemble replacement units under the restricting

hoses.

4.
Reinstall motor and fan into blower assembly. Re-

place cooling tube, ground wire and connect hot wire

to connector.

5. Check blower operations.

Corvette

Replacement

1.
Remove the radiator overflow tank and brackets and

pull the tank out of the way as far as the length of the

heater hose will permit.

2.
Disconnect the electrical connector and the rubber

air inlet tube from the blower motor.

3.
Remove the five blower flange to case attaching

screws and carefully remove the blower motor and

drum assembly.

4.
Remove the blower drum assembly and reinstall on

a new blower motor.

5. Replace the blower motor and drum assembly in the

case and reinstall all screws, hoses and electrical

connections.

All-Weather System

Chevy II

Removal

Under the Hood

1.
Purge the refrigerant from the system.

2.
Drain the radiator.

3.
Remove the refrigerant hoses at the evaporator

pipes.

4.
Remove the evaporator pipe clamp and grommet.

5. Remove three nuts from the blower case studs which

pass through the firewall.

6. Remove heater hoses from core tubes.

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-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-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