TM 5-2420-230-24-1
19-4. A/C SYSTEM SERVICING.
This Task Covers:
a. Leak Test
b. Recovery
c. Evacuation
d. Charging
e. Follow-On Maintenance
INITIAL SETUP
Test Equipment
Equipment Conditions
None
TM or Para
Condition Description
Vehicle positioned on level
ground.
Tools and Special Tools
Reclaimer, refrigerant, Item 32, Appendix B
Parking brake applied.
Tool kit, general mechanics, Item 38, Appendix B
Engine shut OFF.
Tool kit, refrigeration equipment, Item 39, Appendix B
Electrical master switch OFF.
"Do Not Operate" tag attached
to ignition switch.
Materials/Parts
Cloth, lint-free, Item 10, Appendix C
Hood raised.
R-134a refrigerant, Item 52, Appendix C
Drawings Required
None
Personnel Required
MOS 52C, Utilities Equipment Repairer
Estimated Time to Complete Task
1.0 hr.
References
None.
NOTE
Replace receiver-drier if one or more of the following conditions occur before you purge A/C system:
A/C system has been previously opened for service
Too much air or moisture in A/C system
Receiver-drier has been operated for 2 or more years
A/C system opened for longer than 5 min.
Large A/C system leak (break in hose or line)
a. Leak Test.
Contact with refrigerant can cause frostbite. Keep hands and face away to prevent personal injury.
Protective goggles must always be worn when refrigerant lines are opened, even if the gauges
indicate the system is empty.
Always use caution if a fitting is removed. Slowly loosen the fitting. If the system is still under
pressure, release it slowly in a well-ventilated area.
Do not smoke when servicing air conditioners or wherever refrigerant gas may be present. Personal
injury or death can result from inhaling refrigerant through a lit cigarette.
NOTE
If service work is required on an A/C system, the refrigerant must be recovered first before
components are removed.
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