AC DOES NOT COOL OR COOLS INADEQUATELY - Continued

DRAFT

TB 9-2320-279-13-1

AC DOES NOT COOL OR COOLS INADEQUATELY - Continued

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KNOWN INFO

TEST OPTIONS

Power to AC system OK.

Audible test.

Does AC compressor clutch

AC heater/evaporator blower OK.

REASON FOR QUESTION

engage when engine start

AC control circuits OK (except for

switch is turned on, when fan

temperature control and low pressure

If AC compressor clutch does

switches).

control switch is set to an on

not engage, AC

compressor will not

position and temperature

POSSIBLE PROBLEMS

operate.

control switch is set to the

AC condenser dryer desiccant contaminant in

coldest temperature position?

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AC refrigerant system.

AC refrigerant oil contaminant in AC

refrigerant system.

Restricted AC hose.

AC compressor faulty.

Temperature control switch faulty.

Go to Step 21 of this

Moisture in AC refrigerant system.

fault.

Air or other contaminant in AC refrigerant

system.

AC condenser core faulty.

YES

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.

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