Page 881 of 2248

G4M0604
4. INITIAL CHARGING THROUGH THE HIGH SIDE
1) Connect a tachometer to the engine.
2)With the engine off, start charging by slowly opening
the high-pressure manifold valve.
NOTE:
The initial charge rate can be increased by immersing the
can in lukewarm [Below 38°C (100°F)] water for a short
time.
G4M0605
5. CHECK THE GAUGE READINGS
When both the high- and low-pressure gauge readings are
about equal, or the HFC-134a source is empty, or the sys-
tem has been filled to specifications, close the high- pres-
sure manifold valve.
6. ADD ADDITIONAL CANS
If the HFC-134a source is exhausted, first close the high-
pressure manifold valve, second, close the can tap valve,
then slowly purge the refrigerant from the service hose by
loosening the fitting at the can tap. Repeat steps 15
through 19 as necessary.
G4M0606
7. COMPLETE CHARGING THROUGH THE LOW SIDE
1) Verify that the high-pressure manifold valve is closed
(should have already been closed).
2) Verify that the low-pressure manifold valve is closed
(should have already been closed).
G4M0607
3) With the A/C switch off and the windows rolled down,
start the engine and run at idle rpm.
4) Set the A/C controls on maximum cool and set the
blower speed on the highest setting.
5) Quickly turn the A/C switch on-off-on-off a few times to
prevent initial compressor damage due to“load shock.”
Finish this operation with the A/C switch in the ON position.
6) Raise engine rpm to approximately 1,500 rpm.
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4-7SERVICE PROCEDURE
7. Evacuating and Charging
Page 882 of 2248

G4M0608
8. CHARGE THE SYSTEM
1) With the refrigerant source connected and the service
hose purged, slowly open the low-pressure manifold valve,
while checking the low-pressure gauge reading.
CAUTION:
The refrigerant source must be positioned for vapor
(valve up).
2) Keep the low side pressure below 276 kPa (2.81
kg/cm
2, 40 psi) by using the low-pressure manifold valve to
regulate the flow of refrigerant into the system.
3) When the system is fully charged, close the low- pres-
sure manifold valve.
4) Close the valve at the refrigerant source.
Refrigerant capacity
Unit: kg (lb)
Refrigerant Minimum Maximum
HFC-134a 0.6 (1.3) 0.7 (1.5)
9. COMPLETE ALL SYSTEM CHECKS
1) Evaluate the system performance (refer to performance
testing section).
2) Perform leak detection test.
CAUTION:
Always perform leak checking in an environment free
of refrigerant pollution.
Do not disconnect the high- or low-pressure hoses
from the vehicle before leak checking.
10. DISCONNECT THE MANIFOLD GAUGE SET
Remove the high- or low-pressure hoses from the service
ports and install the service port caps.
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7. Evacuating and Charging
Page 883 of 2248

8. Leak Testing
The following points should be kept in mind when conduct-
ing a refrigerant leak test.
1) The A/C system to be tested must have an adequate
refrigerant charge to begin with.
2) The area where the leak test is conducted must be free
of wind and drafts, with still air being the ideal condition.
3) The atmosphere where the leak test is conducted must
be free of refrigerant contamination.
4) Operate the A/C system for approx. 10 minutes, then
turn the engine off an begin the leak test.
5) Refrigerant gas is heavier than air, therefore always
hold the probe below the connection being tested.
6) When checking for a leak along a length of hose or
tube, the leak detector probe must be moved slowly,
approx. 25 mm (1 in) per second making sure probe does
not come in contact with the component being tested.
7) When checking for a leak at a certain point, the leak
detector probe must be held at that point for at least 5
seconds.
G4M0609
1. CHECK THE SYSTEM PRESSURE
With gauges connected to the A/C system, operate the A/C
and confirm that the high side pressure is above 690 kPa
(7.03 kg/cm
2, 100 psi). If not, evacuate and charge the
system before leak checking (refer to evacuation and
charging sections).
2. CLEAN CONNECTIONS BEFORE TESTING
Before testing, use a clean shop towel to wipe off refriger-
ant oil, dirt, or foreign material from all of the connections
and components to be tested.
NOTE:
Since refrigerant oil absorbs refrigerant, excess oil on or
near a connection may falsely signal a leak.
B4M0089
3. CALIBRATE LEAK DETECTOR
Refer to the manufacturer’s instructions for the particular
type of detector used and calibrate the instrument.
CAUTION:
Always make sure that the probe tip filter is clean and
free of contamination.
23
4-7SERVICE PROCEDURE
8. Leak Testing
Page 884 of 2248

G4M0612
4. LEAK TEST — HIGH-PRESSURE SIDE
Operate the A/C system for approx. 10 minutes, then turn
the engine off and begin the leak test.
1) Begin at the connection of the high-pressure tube to the
evaporator, and work your way along the high- pressure
side of the system to the compressor. There are three
places to check on each tube connection.
2) Check the area.
(1) Check the area where the fitting joins the tube.
G4M0613
(2) Check the area where the two parts of the fitting
join each other.
G4M0614
(3) Check the area where the nut joins the tube.
3) Check the area of the sight glass and pressure switch
(dual switch), and also check the seams of the receiver
drier.
4) Check the connections of the tubes to the condenser,
and also check any welded joints on the condenser.
CAUTION:
An oily area on the fins of the condenser may indicate
a leak.
5) Check the area where the hoses attach to the compres-
sor.
6) Check around the machined portions of the compressor
(where the compressor sections join each other).
7) If equipped, check the thermal limiter on the compres-
sor housing.
8) Check the compressor shaft seal by probing near the
center of the compressor clutch pulley.
NOTE:
Some shaft seals have a very slight amount of normal
leakage [approximately 28 g (1.0 oz) per year].
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8. Leak Testing
Page 885 of 2248

G4M0615
5. LEAK TEST—LOW-PRESSURE SIDE
1) Begin at the connection of the low-pressure tube to the
evaporator, and work your way along the low-pressure of
the system to the compressor. There are three places to
check on each tube connection.
2) Check the area.
(1) Check the area where the fitting joins the tube.
(2) Check the area where the two parts of the fitting
join each other.
G4M0616
(3) Check the area where the nut joins the tube.
G4M0617
6. CHECK THE FLEXIBLE HOSES
Visually inspect the rubber portions of the flexible hoses for
cracking. Probe the rubber section, including the ends of
any insulators or protectors which may cover sections of
the rubber hose, and near the ends where the rubber
meets the metal collar.
NOTE:
Be certain to move the probe slowly [approximately 25 mm
(1 in) per second] when probing along any length of hose
or tube.
G4M0618
7. CHECK THE EVAPORATOR ASSEMBLY
1) Use one or both of the following methods to check the
evaporator assembly.
2) Remove the drain hose from the case drain nipple. Hold
the probe at the end of the case drain nipple for at least 10
seconds. Be certain to reconnect the drain hose when fin-
ished.
3) With the ignition key in the“ACC”position, run the
blower on high speed for 1 minute, then turn the blower off.
Place the probe in the center instrument panel vent, an turn
the blower on low speed for 1 to 2 seconds, then turn the
blower off. Leave the probe in the vent for at least 10 sec-
onds.
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4-7SERVICE PROCEDURE
8. Leak Testing
Page 886 of 2248
G4M0619
8. CHECK THE SERVICE PORT CAPS
Visually inspect the inside of the service port caps. Make
sure the rubber seal is in place on the inside of the caps.
Disconnect the gauges from the vehicle and install the
service port caps.
26
4-7SERVICE PROCEDURE
8. Leak Testing
Page 887 of 2248

9. Lubrication
1. SYSTEM OIL STABILIZATION
Prior to opening the refrigerant system for repairs (except
compressor seizure) the system must be stabilized for cor-
rect oil replenishment.
Follow these procedures:
1) Engine speed set to 1,500 rpm
2) A/C“ON”
3) Air source to recirculate
4) Blower in 4th or high speed position
Make sure the air entering the evaporator is above
26.7°C (80°F).
The discharge (high) side pressure must be above
588 kPa (6 kg/cm
2, 85 psi).
5) Operate the A/C for 10 minutes.
2. SYSTEM DISCHARGE
Slowly, discharge the system starting with the high- pres-
sure side until the pressure drops below 345 kPa (3.52
kg/cm
2, 50 psi), then open the low-pressure side.
3. OIL REPLACEMENT (LHD MODEL)
After stabilization and discharge, replace the component,
adding the appropriate amount of oil (ZXL100PG) to the
new component before installation.
Evaporator 114 m(3.9 US fl oz, 4.0 Imp fl oz)
Receiver drier 5 m(0.2 US fl oz, 0.2 Imp fl oz)
Condenser 2 m(0.07 US fl oz, 0.07 Imp fl oz)
Hose 1 m(0.03 US fl oz, 0.04 Imp fl oz)
If the compressor is replaced (after stabilization):
1) Drain and measure the oil from the original compressor.
2) Drain the oil from the replacement compressor and refill
with the same amount that was drained from the original
[20 m(0.7 US fl oz, 0.7 Imp fl oz) minimum]. Always use
ZXL100PG for the replacement oil.
27
4-7SERVICE PROCEDURE
9. Lubrication
Page 888 of 2248

4. OIL REPLACEMENT (RHD MODEL)
After stabilization and discharge, replace the component,
adding the appropriate amount of oil (ND-OIL9) to the new
component before installation.
ConditionProper charging
methodAmount of oil to
be added
m(US fl oz,
lmp fl oz)
Replacement of compressorRemove all oil
from new
compressor and
charge it with
amount of oil
shown in right
column.70 (2.4, 2.5)
Replacement of evaporator—70 (2.4, 2.5)
Replacement of receiver drier
(Liquid tank)Oil need not be
added.—
Replacement of
condenserThere is no sign
of leakage.Oil need not be
added.—
There is
evidence of a
large amount of
oil leakage from
condenser.—50 (1.7, 1.8)
Replacement of
flexible hose or
aluminum pipeThere is no sign
of leakage.Oil need not be
added.—
There is
evidence of a
large amount of
oil leakage.—50 (1.7, 1.8)
Gas leakageThere is no sign
of leakage.Oil need not be
added.—
There is
evidence of a
large amount of
oil leakage.—50 (1.7, 1.8)
If the compressor is replaced (after stabilization):
1) Drain and measure the oil from the original compressor.
2) Drain the oil from the replacement compressor and refill
with the same amount that was drained from the original
[20 m(0.7 US fl oz, 0.7 Imp fl oz) minimum]. Always use
ND-OIL9 for the replacement oil.
28
4-7SERVICE PROCEDURE
9. Lubrication