Heating, Ventilation and Air Conditioning


A/C System Service
Leak Test
Only use service equipment that is U.L.-listed and is cer-
tified to meet the requirements of SAE J2210 to remove
HFC-134a (R-134a) from the air conditioning system.
CAUTION: Exposure to air conditioner refrigerant
and lubricant vapor or mist can irritate eyes, nose
and throat. Avoid breathing the air conditioner
refrigerant and lubricant vapor or mist.
If accidental system discharge occurs, ventilate work
area before resuming service.
R-134a service equipment or vehicle air conditioning sys-
tem should not be pressure tested or leak tested with
compressed air.
Some mixtures of air and R-134a have
been shown to be combustible at elevated pressures
and can result in fire or explosion causing injury or
property damage. Never use compressed air to pres-
sure test R-134a service equipment or vehicle air
conditioner systems.
Additional health and safety information may be obtained
from the refrigerant and lubricant manufacturers.
1. Connect a R-134a refrigerant Recovery/Recycl-
ing/Charging System to the car as shown following
the equipment manufacturer’s instructions.
NOTE: Be sure to install the same amount of new
refrigerant oil back into the A/C system before
2. Open high pressure valve to charge the system to
about 100 kPa (1.0 kg/cm2, 14 psi), then close the
supply valve.
3. Check the system for leaks using a R-134a
refrigerant leak detector with an accuracy of
0.5/oz. per year or better.
4. If you find leaks that require the system to be open-
ed (to repair or replace houses, fittings, etc.),
recover the system according to the Recover Pro-
cedure on page 22-73).
5. After checking and repairing leaks, the system
must be evacuated (see System Evacuation on
page 22-89).
Recovery/Recycling/Charging System