TM 5-2420-231-23-3
0364
LEAK TEST
0364
NOTE
If service work is required on an A/C system, the refrigerant must be recovered before
components are removed.
The A/C system must contain at least 0.88 lb (0.4 kg) of refrigerant. The manifold gauge
set can determine if pressure exists in the system.
Leaks in the high side of the A/C system are more easily found if the A/C is operated for 5
to 10 minutes. The leak test must be performed immediately after the unit is turned off.
The leak test for the high side needs to be performed before the pressure in the A/C
system equalizes.
Leaks in the low side of the A/C system are more easily found if the A/C has been shut off
for 5 to 10 minutes. The leak test for the low side needs to be performed before the
pressure in the A/C system equalizes.
1. Move leak detector sensor tip along possible leak points at a rate of 1 in. per second.
2. Leak detector will indicate if leak is present in A/C system.
END OF TASK
RECOVERY
0364
WARNING
Contact with refrigerant can cause frostbite. Keep hands and face away to prevent
personal injury.
Protective face shield and gloves must always be worn when refrigerant lines are opened,
even if the gauges indicate system is empty.
Always use caution when disconnecting fittings. Slowly loosen the fitting in a well-
ventilated area.
Do not smoke when servicing A/C or wherever refrigerant gas may be present.
Failure to follow these warnings may result in injury or death to personnel.
NOTE
Refrigerant identifier will prevent other refrigerants from contaminating the R134a
recovery and charging tools. Refrigerant identifier also will detect the percentage of air
that may be in the A/C system.
If service is required on the A/C system, the refrigerant must be recovered before
removing the A/C system components.
1.
Ensure refrigerant in A/C system is R-134a.
2. Connect blue low-side hose (Figure 1, Item 3) on suction (low) side (Figure 1, Item 2) of A/C compressor
(Figure 1, Item 1).
3. Connect red high-side hose (Figure 1, Item 4) on discharge (high) side (Figure 1, Item 5) of A/C compressor
(Figure 1, Item 1).
0364-2
