AC DOES NOT COOL OR COOLS INADEQUATELY - continued

DRAFT

TB 9-2320-364-13&P-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 circuit OK (except for temperature

switch is turned on, when fan

control and low pressure switches).

If AC compressor clutch does

control switch is set to an on

not engage, AC

POSSIBLE PROBLEMS

compressor will not

position and temperature

operate.

AC condenser dryer desiccant contaminant in

control switch is set to the

AC refrigerant system.

coldest temperature position?

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AC refrigerant oil contaminant in AC

refrigerant system.

AC system charge low.

AC system leaking.

Restricted AC hoses.

AC compressor faulty.

Go to Step 21 of this

Temperature control switch faulty.

fault.

AC expansion valve faulty.

Moisture in AC refrigerant system.

YES

Air or other contaminant in AC refrigerant

system.

AC condenser core faulty.

AC system overcharged.

AC condenser dryer faulty.

AC evaporator core faulty.

Low pressure switch faulty.

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