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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WARNING

KNOWN INFO

TEST OPTIONS

Read WARNING on

Power to AC system OK.

Pressure test.

AC heater/evaporator blower OK.

AC test set manifold gages.

AC control circuit OK (except for temperature

REASON FOR QUESTION

control and low pressure switches).

Does AC test set recovery/

Low pressure switch OK.

recycling manifold gage

To isolate system fault.

No AC condenser dryer desiccant

indicate normal system low-

contaminant in AC refrigerant system.

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side pressure?

No AC refrigerant oil contaminant in AC

refrigerant system.

AC system charge is not low.

No AC system leaks.

POSSIBLE PROBLEMS

Go to Step 10 of this

Restricted AC hoses.

fault.

AC compressor faulty.

Temperature control switch faulty.

AC expansion valve faulty.

YES

Moisture in AC refrigerant system.

Air or other contaminant in AC refrigerant

system.

AC condenser core faulty.

AC system overcharged.

AC condenser dryer faulty.

AC evaporator core faulty.

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