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 172 of 524

TB 9-2320-279-13-1

0015-4

AC DOES NOT COOL OR COOLS INADEQUATELY - Continued

DRAFT

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KNOWN INFO

Power to AC system OK.

AC heater/evaporator blower OK.

AC control circuits OK (except for

temperature control and low pressure

switches).

POSSIBLE PROBLEMS

AC condenser dryer desiccant contaminant in

AC refrigerant system.

AC refrigerant oil contaminant in AC

refrigerant system.

Restricted AC hose.

AC compressor faulty.

Temperature control switch faulty.

Moisture in AC refrigerant system.

Air or other contaminant in AC refrigerant

system.

AC condenser core faulty.

AC expansion valve faulty.

AC system overcharged.

AC condenser dryer faulty.

AC evaporator core faulty.

AC low pressure switch faulty.

AC system charge low.

AC system leaking.

2.

Does AC compressor clutch

engage when engine start

switch is turned on, when fan

control switch is set to an on

position and temperature

control switch is set to the

coldest temperature position?

Go to Step 21 of this

fault.

NO

YES

TEST OPTIONS

Audible test.

REASON FOR QUESTION

If AC compressor clutch does

not engage, AC

compressor will not

operate.