1967 CHEVROLET CAMARO heater

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-50

Fig.
64—Receiver-Dehydrator Mounting (Corvette)

3.

4.

5.

6.
To gain access to the blower motor end of the as-

sembly, remove the fender and skirt.

Remove the assembly to firewall attaching screws.

Remove the entire assembly from the vehicle.

Reverse the above procedure when installing the

assembly into the vehicle.

Core Replacement

1.
Disconnect the connections at the suction throttling

valve inlet and the expansion valve outlet. Remove

the expansion valve bulb from the core outlet line.

Cap all open lines. .

Remove the screws attaching the evaporator cover

to the firewall and to the evaporator assembly and

remove the cover.

Remove the screws attaching the core to the assem-

bly and remove the core.

Reverse the above steps for core replacement.

Add three fluid oz. refrigerant after installing a

new core, evacuate and charge the system.
2.

3.

4.

5.

Comfortron

The evaporator assembly is nearly identical to that
of the Four-Season system, and, with the exception of

additional wiring and vacuum hoses, service procedures

are the same.

Chevelle Four-Season System

Removal

•
1.
Purge the system of refrigerant, then remove the

right fender skirt and the hood hinge. Do not remove

the fender.

2.
Disconnect the high pressure line (between the

receiver-dehydrator and the thermostatic expansion

valve) at the expansion valve, and the suction throt-

tling valve to compressor line at the suction throt-

tling valve. Cap and seal all open lines.

3.
Remove the three screws attaching the duct assembly

to the evaporator housing and the blower assembly.

4.
Remove the bolts attaching the evaporator assembly

to the cowl and carefully pull the assembly from the

vehicle. The duct assembly will be removed at this

time also.

Core Replacement

1.
With the evaporator assembly removed from the

vehicle, remove the expansion valve and its bulb.

2.
Remove the four nuts and bolts holding the two

halves of the evaporator housing together and sepa-

rate the halves.

3.
The evaporator core may now be removed.

4.
Leak test the new core and connections, before in-

stalling the core in the housing, by installing the

expansion valve and all refrigerant lines. Connect an

R-12 cylinder to the low pressure compressor gauge

fitting and charge the system to cylinder pressure,

then leak test.

5. After satisfactorily testing the core, install it into

the housing and reassemble the two sides of the.

housing.

Installation

1.
Remove the right trim pad and the screws attaching

the air conditioning duct to the kick panel. This

should allow the duct to be pulled slightly loose from

the kick panel. If not it may be necessary to loosen

the entire duct to obtain the necessary clearance.

2.
Install the evaporator in the cowl being sure that

the duct assembly is in place between an evaporator

housing and the blower assembly.

3.
Replace all bolts and screws.

4.
Move the interior air conditioning duct until sure

that the duct gasket is properly positioned over the

evaporator housing flange. Proper gasket fit at this

point is of great importance.

5. Replace all refrigerant lines.

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

refrigerant oil after installing a new core.

7. Replace the fender skirt and hood hinge.

Universal System All Vehicles

Core and/or Expansion Valve Replacement

Since repairs should never be made on the evaporator

core, a defective unit must be replaced. Before replacing

the core, however, check to be sure that any leaks pres-

ent are not located at the hose connections or expansion

valve connections.

CHEVROLET CHASSIS SERVICE MANUAL

HEATER AND AIR CONDITIONING 1A-51

RETAINER

WASHER

GLASS

•O"
RING

Fig.
65-Sight Glass Replacement

Removal

1.
Purge the system.

2.
Disconnect the refrigerant lines at the right rear of

the unit.

3.
Remove the unit from the dash. Disconnect all elec-

trical connectors.

4.
Remove the front cover, withdraw the thermostatic

switch capillary, and separate to the case halves.
5. Remove the clamps from the evaporator inlet and

qutlet pipes.

6. Remove the screws which attach the evaporator to

the case and remove evaporator. '

7. Ljoosen the clamp which mounts the capillary bulb

to the evaporator. Disconnect the inlet and outlet

pipes from the expansion valve and remove the

expansion valve.

Fig.
66—Evaporator Mounting (Chevrolet and Camaro)
Fig.
67—Evaporator Mounting (Chevelle)

CHEVROLET CHASSIS SERVICE MANUAL

HEATER AND AIR CONDITIONING 1A-52

Fig.
68—Wiring and Vacuum Lines—Four-Season (Chevrolet)

Fig.
69-Underhood Wiring-Four-Season (Chevelle)

CHEVROLET CHASSIS SERVICE MANUAL

HEATER AND AIR CONDITIONING 1A-53

Fig.
70—Wiring and Vacuum Lines—Four-Season (Camaro)

Installation

1.
Connect the expansion valve to the refrigerant pipes.

Attach the capillary bulb to the evaporator.

2.
Attach the evaporator to the- case. Attach the inlet

and outlet pipes clamps.

3.
Assemble the case halves. Insert the capillary tube

from the thermostatic switch between the fins as

shown in Figure . Attach the cover plate to the

case.

4.
Mount the unit to the dash and connect the refrigerant

lines.

5.
Evacuate and charge the system. If a new evaporator

was installed, add three fluid ounces of refrigerant

oil to the system before charging.

6. Test system operation.

Chevy II All-Weather System

Removal

Under
the Hood

1.
Purge the refrigerant from the system.

2.
Remove the refrigerant hoses from the evaporator

inlet and outlet connections extending through the

special grommet in the dash panel and into the

engine compartment.

3.
Remove the screw, nut, spacer bracket and grommet

from the outlet connection pipes.
Within the Car

4.
Remove the glove box, ash tray and ash tray

retainer.

5.
Reach through the glove box door to disconnect the

air conditioning "on" door bowden cable (fig. 75).

6. Remove the two shield attaching screws and shield

(A, fig. 76) which covers the lower right evaporator

bracket-to-blower bracket attaching screw (B, fig.

76),
then remove this screw.

7.
Behind the lower left side of ihe evaporator, remove

the evaporator bracket-to-heater distributor bracket

attaching screw (C, fig. 76).

8. Reaching through the glove box door and ash tray

openings, remove the two nuts and washers (D,

fig.
76) attaching the evaporator assembly studs to

the lower instrument panel flange and reinforcement.

9. Disconnect the drain hoses and carefully pull the

evaporator unit toward the rear of the vehicle.

10.
Disconnect wiring connectors (see fig. 77) as nec-

essary and remove the evaporator unit from the

vehicle.

Gore and/or Expansion Valve Replacement

A defective unit must be replaced since repairs should

never be made on the evaporator core. Before replacing

the core, however, check to be sure that any leaks pres-

sent are not located at the hose connections or expansion

valve connections. The following procedure assumes that

the evaporator unit has been removed from the vehicle

as outlined above.

CHEVROLET CHASSIS SERVICE MANUAL

HEATER AND AIR CONDITIONING 1A-54

Fig.
71-Wiring-AH Weather (Chevy II)

1.
Loosen the lock screws and remove the two control

knobs from the front of the evaporator unit. Then

use a suitable spanner wrench to remove the two

nuts beneath the control knobs.

2.
Remove the screws (located in the outer ball outlets)

attaching the face plate.to the evaporator case. Then

remove the face plate and, reaching through this

opening, carefully remove the plug attaching the

thermostatic switch capillary tube to the evaporator

core.

3.
Turning the unit over, remove the screws attaching

the back cover and gasket to the case and remove

the cover and gasket.

4.
From the top of the case, remove the screws attach-

ing the evaporator core brackets to the case.

5.
Carefully draw the core and expansion valve assem-

bly out of the case.

NOTE: The air conditioning "on" door bowden

cable, which extends through the core, will also

be removed at this time.

6. Remove the expansion valve power element from

the low pressure line.
7.
Disconnecting the high pressure and low pressure

lines from the valve, remove the valve from the

core.

8. At this point either the expansion valve, evaporator

core or both may be replaced.

a. If replacing the expansion valve, use new etO"

rings and make the connections carefully to

eliminate possible refrigerant leaks. Position

the power element bulb so that it lies flush with

the low pressure line and has the insulating

material properly in place.

b.
If the evaporator core is to be replaced, it will

be necessary to remove the air conditioning

door bowden cable from the core and install it

in the same location in the replacement core.

If no passage has been provided for this purpose

in the replacement core, a pointed instrument

such as a pencil may be forced through core

vanes at the proper location to provide the re-

quired opening. Also remove the spacer bracket,

nut and screw from the inlet and outlet pipes of

the evaporator core and place them in a like

position on the replacement core.

CHEVROLET CHASSIS SERVICE MANUAL