engine CHEVROLET CAMARO 1967 1.G Chassis Owner's Guide
[x] Cancel search | Manufacturer: CHEVROLET, Model Year: 1967, Model line: CAMARO, Model: CHEVROLET CAMARO 1967 1.GPages: 659, PDF Size: 114.24 MB
Page 58 of 659
HEATER AND AIR CONDITIONING 1A-35
Checking Condition of Thermistors (Sensors)
1.
Install Tester J-22368 as previously described.
2.
Start the engine and run at fast idle. Move the
Comfortron control lever to HI-FRONT.
•Set Rocker switch to MANUAL.
•Set Manual Control Knob to 150 ohms on scale.
3.
Set the Tester Voltage switch to AMPLIFIER.
4.
Rotate Comfortron Temperature dial until the Tester
voltmeter reads 6.5 volts. The dial should read 75°,
Adjust dial if necessary.
5.
After car has run (windows and doors closed) for at
least 10 minutes, switch Rocker switch to AUTO-
MATIC. Voltage reading should remain at 6.5. A
change in the voltage indicates a bad sensor.
6. If a bad sensor is indicated in Step 5, check each
sensor, disconnected from the system, with an ohm-
meter. Approximate resistance of each sensor at
75°F.
should be as follows:
In-car Sensor — 50-75 ohms
Ambient Sensor --,55 ohms or less
Duct Delay Sensor -.- 25-75 ohms
Feedback
Potentiometer —
Master Delay
Thermistor -- 70 ohms
High Blower Delay
Thermistor -- 80 ohms including
10 ohm resistor
(Located in Power Servo casting)
VACUUM
ELECTRICAL LEAD
GROUND
LEAD
Fig.
47—Comfortron System Tester x
COMPLETE SYSTEM CHECKS
The following information should be used whenever
preliminary checks indicate the need for further, more
specific, tests. Together with the Electrical Test Dia-
gram (fig. 49) and the Vacuum Diagram (fig. 50),
they may be used to accurately pinpoint any malfunction
of the system.
Fig.
48—Comfortron Tester Installation
CHEVROLET OU
SERVICE MANUAL
Page 59 of 659
HEATER AND AIR CONDITIONING 1A-36
(These tests should be performed with the engine at operating temperature.)
SYSTEM CHECKS
Control
Head
Setting
High
Front
Lo
Front
Lo
Front
Hi
Front
Hi
Front
Tester Settings
Function
Manual
Manual
Manual
Manual
De-ice
65° on
Temp.
Dial
Hi
Front
Hi
Front
Hi
Front
Auto-
Matic
1 1
Auto-
matic
Manual
Manual
Manual
Control
Max.
Heat
Rotate
from
Max.
Heat to
Max.
Cold
150
Max.
Cold
Max.
Cold
Max.
Cold
Max.
Heat
Max.
Heat
Max.
Cold
Voltage
Trans-
ducer
Trans-
ducer
Ampli-
fier
Trans-
ducer
Probe
Probe
Trans-
ducer
Trans.
Tester Should
Indicate:
High Blower
Maximum Heat
Reduced Blower
Speed
Complete series of
blower changes from
Hi to Lo to Hi
again.
AMPLIFIE:
Remove conn, from c
Voltage reading she
Short this lead to grc
Voltage reading she
No voltage change in<
COMPRESSOR C
Cooling System
Operation
DE-ICE i
Assuming rest of
system is operating
normally: Max. Heat
1
to windshield.
SENSOR STR
•—
TRAtfSDtfC
0-3"
Vac. Reading
8 Volts Min.
9"
Min.
Vac.
Reading
0-4 Voltage Reading
If not, check
the following:
Fuse in Slock
In Line Fuse
High Blower
Delay Relay
Duct Delay
Thermistor
High Blower
Delay Sensor
Power Servo
Blower Switch
Resistor
Blower Motor
Wiring Harness
Blower Switch
Master Delay
Thermistor
Master Delay
Relay
Resistor
Power Servo
Blower Motor
CHECK
Resistor
I CHECK
Electrical Diagram
Probe Points:
1-2
8-9
10-21
20
18
19
*
9-46
-r
^2-3
15
16
Checked during
above procedure.
(This is a com-
plete step-by-step
high blower circuit
check which also
checks wiring
harness.)
4
5
6
L2-13
L4
""§2-15
39-46
1
16 1
14
22-40-42-44-15
.ontrol head temperature dial.
>uld be 9 volts minimum,
jund.
>uld be 0 volts,
iicates malfunctioning of amplifier.
JUTCJH CHUCK
Compressor Clutch
(Grille Temp, must
be above 40°.)
IRCUIT
Blower Switch
Master Delay
Relay
Transd
NGCl
ucer
Sensor String
2R CHECK
Transducer voltage
&t Max. Cold
position)
Transducer Ground
Hi Blower Outside
air (air door closed
to car body). Hot air
from heater outlets.
Hi Blower Recirc.
Air (air door open
to car body) cold air
from A/C outlets.
24-25-26-27-28
Voltmete
should re
ad
Battery Voltage
Battery Voltage
Battery Voltage
. Vtinimum
6
volts
Battery Voltage
Minimum
6
volts
Battery Vo]
Batterv Vo]
Ltage
Ltage
Battery Voltage
Batterv Voltage
3a
Bai
:terv Vo
tterv Vo
tage
tage
Minimum
6
volts
Batterv Voltage
Minimum
6
volts
Battery Voltage
Minimum
8
volts
Minimum 8 volts
Minimum 8 volts
Batterv Voltage
Minimum 8 volts
1 III • II »ll. —..• —•— . !!•• 1
Battery Voltage
3-23
20-10-21
38
29-30-31-32-33-
34-35-36
37-38
Defective Power Servo; Leak in Vacuum
System; Temp.; Door Link Disconnected
or Jammed; Defective Vacuum Relay
Valve
Defective Mode Door Diaphragm
Batterv Voltage
Battery Voltage
Zero Voltage
Battery Voltage
Battery Voltage
CHEVROLET CHASSIS SERVICE MANUAL
Page 63 of 659
HEATER AND AIR CONDITIONING 1A-40
THERAAAL VACUUM
VALVE
TO ENGINE
VACUUM
SOURCE
VACUUM STORAGE
TANK
OUTSIDE AIR
DIAPHRAGM
MODE
DIAPHRAGM
VACUUM
RELAY
BLACK
DEFOG-DEICE
DIAPHRAGM
GREEN
BLACKj ||
|
BROWN
CONTROL
VALVE
Fig.
50—Comfortron Vacuum Diagram
are fused which will lead to evaporator freeze-up.
Replace the switch.
• If the compressor does not operate regardless of
the position of the knob a loss of the power
element charge is indicated provided that it has
been established that power is supplied to the
switch. This, of course, results in no cooling.
Replace the switch.
• Check the screw threads for stripped or other-
wise damaged threads.
Adjusting Switch
H, after checks above, the switch seems to be operating
properly,
follows:
adjust for proper setting if necessary, as
1.
(Chevy II All-Weather) Turn the outer air deflector
in the face plate so that the attaching screws may
be removed; Then remove the control knobs, bezels
and the thermostatic switch. (Universal) remove the
face plate retaining screws. Pull the faceplate away
from the case when ready to turn the switch adjusting
screw.
2.
Vehicle must be set up as in Step 2 above.
3.
The suction side of the system, read on the low
pressure gauge, should pull down to the pressure
shown in the chart in Performance Test under the
ambient temperature at the time the switch is being
set.
4.
If the low side pulls down lower than the prescribed
pressure at the end of each cooling cycle, turn the
adjusting screw (See Figure 54) clockwise in single
CHEVROLET CHASSIS SERVICE MANUAL
Page 65 of 659
HEATER AND AIR CONDITIONING 1A-42
EXTERNAL
EQUALIZER LINE
Fig. 54—Thermosratic Switch Adjustment
POORLY LOCATED POWER ELEMENT BULB
Normal Pressure.
Poor Cooling.
ENGINE IDLE COMPENSATOR
This additional aid to prevent stalling during prolonged
hot weather periods is included with all air conditioned
vehicles. The idle compensator is a thermostatically
controlled air bleed which supplies additional air to the
idle mixture. On V-8 engines, with factory installed air
Fig. 55—Expansion Valve
conditioning systems, the compensator is located within
the carburetor and is accessible when the engine air
cleaner is removed. On all other vehicles the compen-
sator is threaded into a manifold, fitting below the
carburetor. All compensators are factory set and are
non-adjustable. A malfunctioning unit should be replaced.
NOTE:
If engine idle is erratic, hold the idle
compensator valve closed with a pencil or
wooden dowel while adjusting the idle mixture
screw(s). Never attempt to bend the bimetal
strip or attempt any valve adjustment.
EVACUATING AND CHARGING PROCEDURES
1967 AIR CONDITIONING SYSTEM CAPACITIES
Four-Season Systems (Chevrolet and Chevelle)
Universal System (Chevrolet, Chevelle and Camaro)
Universal and All-Weather System (Chevy II)
Refrigerant Charge
3 lbs., 12 oz.
3 lbs.
2 lbs., 8 oz.
Oil Charge
11 ozs. 525 viscosity
11 ozs. 525 viscosity
11 ozs. 525 viscosity
PURGING THE SYSTEM
In replacing any of the air conditioning components the
system must be completely purged or drained of re-
frigerant. The purpose is to lower the pressure inside
the system so that a component part can be safely
removed.
1.
With engine stopped install high and low pressure
lines of gauge set to the proper high and low pres-
sure gauge fittings (see "Installing Gauge Set to
Check Operation").
2.
With plug removed from the centerline on the gauge
manifold, open high pressure gauge valve and dis-
charge the vapor slowly through the center
connection.
CAUTION: Do
compressor
refrigerant.
not open valves too much or
oil may be discharged with the
A rag wrapped around the end of
the center gauge line will prevent the splashing
of oil in the event of accidental rapid discharge.
CHEVROLET CHASSIS SERVICE MANUAL
Page 66 of 659
HEATER AND AIR CONDITIONING 1A-43
LOW PRESSURE
CONTROL
HIGH PRESSURE
CONTROL
3
VACUUM
CONTROL
4
FREON
CONTROL
Fig,
56—Charging Station Controls
3.
When the pressure is reduced to below 100 pounds
on the high pressure gauge, open the low pressure
gauge valve and continue discharging until all re-
frigerant has been released. Close both gauge valves.
EVACUATING AND CHARGING THE SYSTEM
GENERAL NOTE: La all evacuating procedures
shown below, the specification of 26-28 inches
of Mercury vacuum is used. These figures are
only attainable at or near Sea Level Elevation.
For each 1000 feet above sea level where this
operation is being performed, the specifications
should be lowered by 1 inch. Example: at 5000
ft. elevation, only 21 to 23 inches of vacuum can
normally be obtained.
Whenever the air conditioning system is open for any
reason, it should not be put into operation again until it
has been evacuated to remove air and moisture which
may have entered the system.
The following procedures are based on the use of the
J-8393 Charging Station.
Filling Charging Cylinder
1.
Open control valve on refrigerant drum.
2.
Open valve on bottom of charging cylinder allowing
refrigerant to enter cylinder.
3.
Bleed cylinder valve on top (behind control panel) as
required to allow refrigerant to enter. When re-
frigerant reaches desired level (see "Air Condition-
ing System Capacities"), close valve at bottom of
cylinder and be certain bleed valve is closed
securely.
NOTE: It will be necessary to close bleed valve
periodically to allow boiling to subside to check
level in sight glass.
Installing Charging Station to System
1.
Be certain all valves on charging station are closed.
2.
Connect high pressure gauge line to high pressure
gauge fitting. (See "Installing Gauge Set to Check
System Operations.")
3.
See Figure 56. Turn high pressure control (2) one
turn counter-clockwise (open). Crack open low pres-
sure control (1) and allow refrigerant gas to hiss
from low pressure gauge line for three seconds,
then connect low pressure gauge line to low pressure
gauge fitting.
4.
System is now ready for performance testing.
Evacuating and Charging System
1.
Install charging station as previously described.
Refer to Figure 56 and 57 while performing the
following operation.
2.
Remove Low Pressure gauge line from compressor.
3.
Crack open high (2) and low (1) pressure control
valves, and allow refrigerant gas to purge from
system. Purge slow enough so that oil does not
escape from system along with Refrigerant.
4.
When refrigerant flow stops, connect Low Pressure
gauge line to compressor.
5.
Turn on vacuum pump and open Vacuum Control
Valve (3).
6. With system purged as above, run pump until 28-29
inched of vacuum is obtained. Continue to run pump
for 15 minutes after the system reaches 28-29 inches
vacuum.
7.
If 28-29 inches cannot be obtained, close Vacuum
Control Valve (3) and shut off vacuum pump. Open
Refrigerant Control Valve (4) and allow 1/2 pound of
R-12 to enter system. Locate and repair all leaks.
8. After evacuating for 15 minutes, add 1/2 pound of
R-12 to system as described in Step 7 above. Purge
this 1/2 pound and reevacuate for 5 minutes. This
second evacuation is to be certain that as much con-
tamination is removed from the system as possible.
9. Only after evacuating as above, system is ready for
charging. Note reading on sight glass of charging
cylinder. If it does not contain a sufficient amount
for a full charge, fill to the proper leveL
10.
With High and Low pressure Valves (1 and 2) open,
close Vacuum Control Valve (3) and open Freon
Control Valve (4). Operating the heater and air
conditioner blower with the controls set for cooling
will help complete the charging operation.
NOTE: If the charge will not transfer com-
pletely from the station to the system, close
the high pressure valve at the gauge set, set
the air conditioning controls for cooling, check
that the engine compartment is clear of ob-
structions, and start the engine. Compressor
operation will decrease the low side pressure
in the system.
System is now charged and should be performance
tested before removing gauges.
CHECKING OIL
In the six cylinder compressor it is not recommended
that the oil be checked as a matter of course. Gener-
ally, compressor oil level should be checked only where
there is evidence of a major loss of system oil such as
might be caused by:
• A broken refrigerant hose.
• A severe hose fitting leak.
CHEVROLET CHASSIS SERVICE MANUAL
Page 68 of 659
HEATER AND AIR CONDITIONING 1A-45
• A very badly leaking compressor seal.
• Collision damage to the system components.
As a quick check on compressor oil charge, with the
engine off, carefully crack open the oil drain plug on the
bottom of the compressor. If oil comes out, the com-
pressor has the required amount of oil To further check
the compressor oil charge, should the above test show
insufficient oil, it is necessary to remove the compressor
from the vehicle, drain and measure the oil.
Checking Compressor Oil Charge
1.
Run the system for 10 minutes at 500-600 engine
rpm with controls set for maximum cooling and
high blower speed.
2.
Turn off engine, discharge the system, remove
compressor from vehicle, place it in a horizontal
position with the drain plug downward. Remove the
drain plug and, tipping the compressor back and
forth and rotating the compressor shaft, drain the
oil into a clean container, measure and discard the
oiL
3.
a. If the quantity drained was 4 fluid oz. or more,
add the same amount of new refrigerant oil to
the replacement compressor.
b.
If the quantity drained was less than 4 fluid oz.,
add 6 fluid oz. of new refrigeration oil to the
replacement compressor.
c. If a new service compressor is being installed,
drain all oil from it and replace only the amount
specified in Steps 3a and 3b above.
d. If a field repaired compressor is being installed,
add an additional 1 fluid oz. to the compressor.
4.
In the event that it is not possible to idle the com-
pressor as outlined in Step 1 to effect oil return to
it, proceed as follows:
a. Remove the compressor, drain, measure and
discard the oil.
b.
If the amount drained is more than 1-1/2 fluid
oz.
and the system shows no signs of a major
leak, add the same amount to the replacement
compressor.
c. If the amount drained is less than 1-1/2 fluid oz.
and the system appears to have lost an excessive
amount of oil add 6 fluid oz. of clean refrigeration
oil to replacement compressor, 7 fluid oz. to a
repaired compressor.
If the oil contains chips or other foreign ma-
terial, replace the receiver-dehydrator and flush
or replace all component parts as necessary. Add
the full specified volume of new refrigeration oil
to the system.
5.
Add additional oil in the following amounts for any
system components being replaced.
Evaporator 3 fluid oz.
Condenser . . . . ... . . . . . . 1 fluid oz.
Receiver-Dehydrator ....... 1 fluid oz.
NOTE: When adding oil to the compressor, it
will be necessary to tilt the rear end of the
compressor up so that the oil will not run out
of the suction and discharge ports. Do not set
the compressor on the shaft end.
Adding Oil to the System
The system should be completely assembled and un-
charged before adding oil. Use only uncontaminated
refrigerant oil (525 viscosity) and add as follows:
1.
Connect the low pressure line from the gauge set
to the low pressure gauge fitting on the P.O.A.
valve (Four-Season) or low pressure fitting on the
compressor connector Mock (Universal System).
2.
Connect the high pressure line from the charging
station gauge set to the compressor muffler or high
pressure side of the connector block.
3.
Disconnect the high pressure line from the gauge set,
make certain that the line is clean, and place the
end in a graduated container.
4.
Pour enough refrigerant oil into the container so
that the required volume may be drawn into the
system by the high pressure hose.
5.
Close the high pressure valve at the gauge set,
and open the low pressure valve.
6. Operate the vacuum pump to drop the pressure within
the system and cause atmospheric pressure to force
oil through the high pressure line into the system.
When the oil level has dropped the required volume,
pull the line out of the oil container and continue
vacuum pump operation to force the oil contained
in the line into the system.
7.
Shut off the vacuum pump and connect ttye high
pressure line to the gauge set. Open the high
pressure valve and evacuate the system through
the high and low pressure sides of the system.
Complete the charging operation as outlined in Step
10 under "Evacuating and Charging System".
COMPONENT REPLACEMENT AND MINOR REPAIRS
REFRIGERANT LINE CONNECTIONS
"O"
Rings
Always replace the "O" ring when a connection has
been opened. When replacing the "O" ring, first dip it
in refrigeration oil. Always use a backing wrench on
"O"
ring fittings to prevent the pipe from twisting and
damaging the "O" ring. Do not overtighten. Correct
torque specifications are as follows:
Metal
Tube
O.D.
1/4
3/8
1/2
5/8
3/4
Thread and
Fitting
Size
7/16
5/8
3/4
7/8
1-1/16
Steel
Tubing
Torque*
13
33
33
33
33
Alum.
Tubing
Torque*
6
12
12
20
25
* Pound Feet
CHEVROLET CHASSIS SERVICE
Page 70 of 659
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
Page 71 of 659
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
Page 72 of 659
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
Page 76 of 659
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