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TJ
DIAGNOSIS AND TESTING (Continued)
components that appear to be oily indicate a possible
refrigerant leak . To detect a leak in the refrigerant
system, perform one of the following procedures :
SYSTEM EMPTY
(1) Evacuate the refrigerant system . See Refriger-
ant System Evacuate in this group .
(2) Connect and dispense 0 .283 kPa (0 .6 lbs . or 10
oz .) of R-134a refrigerant into the evacuated refriger-
ant system . See Refrigerant System Charge in this
group.
(3) Position the vehicle in a wind-free work area .
This will aid in detecting small leaks.
(4) With the engine not running, use a electronic
R-134a leak detector and search for leaks . Move the
leak detector probe slowly along the bottom side of
all lines and fittings, because R-134a is heavier than
air.
(5) To inspect the evaporator coil for leaks, insert
the leak detector probe into the center panel outlet .
Set the blower motor switch to the lowest speed posi-
tion, and the mode control switch in the Recircula-
tion Mode .
SYSTEM LOW
(1) Position the vehicle in a wind-free work area .
This will aid in detecting small leaks.
(2) Bring the refrigerant system up to operating
temperature and pressure . This is done by allowing
the engine to run with the air conditioning system on
for five minutes .
(3) With the engine not running, use a electronic
R-134a leak detector and search for leaks . Move the
leak detector probe slowly along the bottom side of
all lines and fittings, because R-134a is heavier than
air.
(4) To inspect the evaporator coil for leaks, insert
the leak detector probe into the center panel outlet .
Set the blower motor switch to the lowest speed posi-
tion, and the mode control switch in the Recircula-
tion Mode .
SERVICE PROCEDURES
REFRIGERANT RECOVERY
WARNING : REVIEW THE WARNINGS AND CAU-
TIONS IN THE FRONT OF THIS GROUP BEFORE
RECOVERING REFRIGERANT.
R-134a refrigerant is a hydrofluorocarbon (HFC)
that does not contain chlorine . A R-134a refrigerant
recovery/recycling station that meets SAE Standard
J2210 must be used to recover the refrigerant . Refer
to the operating instructions provided with the equip-
ment for proper operation .
HEATING AND AIR CONDITIONING
24- 1 9
REFRIGERANT SYSTEM EVACUATE
WARNING : REVIEW THE WARNINGS AND CAU-
TIONS IN THE FRONT OF THIS GROUP BEFORE
EVACUATING THE SYSTEM .
If the refrigerant system has been open to the atmo-
sphere, it must be evacuated before the system can be
charged. Moisture and air mixed with the refrigerant
will raise the compressor head pressure above accept-
able operating levels . This will reduce the performance
of the air conditioner and damage the compressor. Evac-
uating will boil the moisture out of the refrigerant sys-
tem at near room temperature .
To evacuate the
refrigerant system, use the following procedure :
(1) Connect a suitable charging station and mani-
fold gauge set to the vehicle .
(2) Open the low and high side valves and start
the vacuum pump . When the suction gauge reads 88
kPa (26 in . Hg .) vacuum or greater, close all of the
valves and turn off the vacuum pump . If the system
fails to reach the specified vacuum, the system has a
leak that must be corrected . If the system maintains
the specified vacuum for five minutes, restart the
vacuum pump . Then open the suction and discharge
valves and evacuate an additional ten minutes .
(3) Close all of the valves . Turn off and disconnect
the vacuum pump .
(4) The refrigerant system is now ready to be
charged with refrigerant .
REFRIGERANT SYSTEM CHARGE
WARNING : REVIEW THE WARNINGS AND CAU-
TIONS IN THE FRONT OF THIS GROUP BEFORE
CHARGING THE REFRIGERANT SYSTEM .
After the system has been tested for leaks and
evacuated, a refrigerant charge can be injected into
the system. See Refrigerant Charge Capacity for the
proper amount of the refrigerant charge . Charge the
system using a recovery/recycling/charging station
approved for R-134a refrigerant. This device must
meet SAE Standard J2210. Refer to the instructions
provided with the equipment for proper operation .
REFRIGERANT CHARGE CAPACITY
The R-134a system charge capacity is 0 .567 kg
(1 .25 lbs . ) .
REFRIGERANT OIL LEVEL
When an air conditioning system is assembled at
the factory, all components (except the compressor)
are refrigerant oil free . After the system has been
charged and operated, the oil in the compressor is
dispersed through the refrigerant system . The accu-
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