TB-9-2320-279-13-1
TECHNICAL BULLETIN; AIR CONDITIONING SYSTEM
OPERATOR’S, UNIT AND DIRECT SUPPORT MAINTENANCE MANUAL, INSTALLATION INSTRUCTIONS, AND REPAIR PARTS AND SPECIAL TOOLS LISTS
DECEMBER 2005
TB-9-2320-279-13-1 - Page 193 of 524
TB 9-2320-279-13-1
0015-25
AC DOES NOT COOL OR COOLS INADEQUATELY - Continued
DRAFT
WARNING
•
Moving engine components can cause severe injury.
Keep away from fan, belts, and pulleys while
engine is running.
•
Remove rings, bracelets, wristwatches, neck chains, and any other jewelry before working around
vehicle.
Jewelry can catch on equipment and cause serious injury.
Jewelry or tools may short
across electrical circuits or terminals and cause damage to equipment or severe burns or
electrical shock to personnel.
•
Wear protective goggles and nonleather gloves when servicing air conditioner system.
Failure to
comply may result in injury to personnel.
HEMAC185
PRESSURE TEST
(1)
Inspect AC test set recovery/recycling manifold
high-side gage reading.
(a) If gage reading is not indicating a high system
high-side pressure for the ambient
temperature indicated in the chart shown on
page 0015-11, go to Step 19 of this fault.
(b) If gage reading is indicating a high system
high-side pressure for the ambient
temperature indicated in the chart shown on
page 0015-11, go to Step 17 of this fault.
VISUAL INSPECTION
(1)
Remove four screws, lockwashers, washers, and
cover from AC condenser assembly (WP 0027).
(2)
Inspect system high-side AC hoses from AC
compressor output to AC heater/evaporator
assembly for frost and cool spots.
(a) If hoses are not free from frost and cool spots:
1.
Shut off engine (TM 9-2320-279-10).
2.
Recover R-134a refrigerant (WP 0050).
3.
Replace restricted AC hose (WP 0040).
4.
Replace AC condenser dryer (WP 0025).
5.
Evacuate and charge system (WP 0050).
6.
Verify repair, go to Step 22 of this fault.
(b) If hoses are free from frost and cool spots, go
to Step 18 of this fault.
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