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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WARNING

KNOWN INFO

TEST OPTIONS

Read WARNING on

Power to AC system OK.

Visual inspection.

page 0015-7.

AC heater/evaporator blower OK.

AC test set manifold gages.

AC control circuits OK (except for

Does AC condenser dryer

REASON FOR QUESTION

temperature control and low pressure

sight glass indicate system is

switches).

If AC condenser dryer sight

AC low pressure switch OK.

free from desiccant

glass indicates desiccant

breakdown and oil?

breakdown or oil in

POSSIBLE PROBLEMS

system, system must be

flushed.

AC condenser dryer desiccant contaminant in

AC refrigerant system.

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AC refrigerant oil contaminant in AC

refrigerant system.

Perform leak test

Restricted AC hose.

(WP 0049). Recover

AC compressor faulty.

R-134a refrigerant

Temperature control switch faulty.

(WP 0050). Repair

Moisture in AC refrigerant system.

any leaks found.

Flush system

Air or other contaminant in AC refrigerant

YES

(WP 0050). Replace

system.

AC condenser dryer

AC condenser core faulty.

(WP 0025).

AC expansion valve faulty.

Evacuate and charge

AC system overcharged.

system with new

AC condenser dryer faulty.

R-134a refrigerant

AC evaporator core faulty.

(WP 0050). Go to

Step 4 of this fault.

AC system charge low.

AC system leaking.

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0015-6