1 25 15. A/C SYSTEM SERVICING
This task covers:
a. Manifold Gauge Set Installation
b. Manifold Gauge Set Removal
d. Flushing System
e. Evacuating System
f. Charging System
g. Adding Refrigerant Oil
Hood raised and secured (TM 9-2320-387-10).
General Safety Instructions
General mechanics tool kit:
automotive (Appendix B, Item 1)
Flushing cylinder (Appendix B, Item 128)
Flush gun (Appendix B, Item 129)
Service refrigeration unit tool kit
(Appendix B, Item 131)
Vacuum pump (Appendix B, Item 132)
Manifold gauge set (Appendix B, Item 130)
Lubricating oil (Appendix C, Item 48)
Refrigerant R-134a (Appendix C, Item 56)
Nitrogen (Appendix C, Item 51)
Flushing agent (Appendix C, Item 30)
Exercise extreme care when handling R-134a.
Do not attempt to connect servicing equipment
while engine is running.
Ensure hand valves on manifold gauge set are
closed during connection; hoses must be clear of
any moving engine parts.
Eye protection must be worn when using
wear eye protection when working with
Always wear eye protection when using R-134a or when
servicing the air conditioning system. Injury will result if
R-134a comes in contact with eyes.
Exercise extreme care when handling R-134a. Direct contact
between R-134a and skin may cause frostbite.
Always use recovery machine.
Do not attempt to connect servicing equipment while engine is
running. Injury to personnel or damage to equipment may
Whenever any air conditioning vapor system component needs
replacement, the system must be discharged, flushed, and a new
dryer bottle installed (para. 25-16).