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JR
HEATING & AIR CONDITIONING (Continued)
A R-134a gauge set (Fig. 4) must be used in con-
junction with the charging/recovery/recycling device.
The service hoses on the gauge set should have auto-
matic back flow valves at the service port connector
ends. This will prevent refrigerant R-134a from being
released into the atmosphere.
Fig. 4 Manifold Gauge Set - Typical
1 - LOW PRESSURE GAUGE
2 - HIGH PRESSURE GAUGE
3 - VALVE
4 - VACUUM/REFRIGERANT HOSE (YELLOW W/BLACK STRIP)
5 - HIGH PRESSURE HOSE (RED W/BLACK STRIP)
6 - LOW PRESSURE HOSE (BLUE W/BLACK STRIP)
7 - VALVE
R-134a refrigerant requires a special type of com-
pressor oil. When adding oil, make sure that it is
designed to be used in a R-134a system. Refer to the
label under the hood for proper oil and refrigerant
charge levels (Fig. 5).
Fig. 5 Underhood Label
The use of R-134a will have a positive environmen-
tal impact due to it's zero ozone depletion and low
global warming impact.
HEATING & AIR CONDITIONING
STANDARD PROCEDURE - SYSTEM CHARGE
LEVEL
The procedure below should be used to check
and/or fill the refrigerant charge in the air condition-
ing system.
NOTE: The maximum amount of R-134a refrigerant
that the air conditioning system holds is listed on
the underhood label.
To verify proper charge level, evacuate (reclaim)
and recharge system to the proper refrigerant level.
STANDARD PROCEDURE - CHARGING A/C
SYSTEM
PARTIAL CHARGE
This vehicle does not have a sight glass. It is not
possible to determine the amount of R-134a charge in
the system. Therefore it is necessary to completely
evacuate and recover the system, and then recharge
the system fully.
EVACUATION
Before adding refrigerant, all air must be evacu-
ated from the system.
• Connect a manifold gauge set to the A/C service
ports.
• Use a vacuum pump or charging station and
evacuate system to 95 kPa (28 inches Hg) for 30 min-
utes.
• Go to Charging A/C System below.
CHARGING A/C SYSTEM
The procedure below should be used to fill the
refrigerant charge in the air conditioning system.
This A/C system does not have or use a sight glass to
check or charge the system.
WARNING: AVOID BREATHING A/C REFRIGERANT
AND LUBRICANT VAPOR OR MIST. EXPOSURE
MAY IRRITATE EYES, NOSE AND THROAT. USE
ONLY APPROVED SERVICE EQUIPMENT MEETING
SAE REQUIREMENTS TO DISCHARGE R-134a SYS-
TEM.
IF
ACCIDENTAL
OCCURS,
VENTILATE
RESUMING SERVICE.R-134a SERVICE EQUIPMENT
OR VEHICLE A/C SYSTEM SHOULD NOT BE PRES-
SURE TESTED OR LEAK TESTED WITH COM-
PRESSED AIR. MIXTURE OF AIR and R-134a CAN
BE COMBUSTIBLE AT ELEVATED PRESSURES.
THESE MIXTURES ARE POTENTIALLY DANGER-
OUS AND MAY RESULT IN FIRE OR EXPLOSION
CAUSING INJURY OR PROPERTY DAMAGE.
24 - 9
SYSTEM
DISCHARGE
WORK
AREA
BEFORE
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