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 173 of 524

TB 9-2320-279-13-1

0015-5

AC DOES NOT COOL OR COOLS INADEQUATELY - Continued

DRAFT

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HEMAC175

AUDIBLE TEST

NOTE:

Do not start engine during this procedure.

AC

compressor clutch operation will be checked by listening

for a clicking sound from the AC compressor when the

engine start switch is turned to ON position.

(1)

Open driver side engine cover and remove engine

side panel (TM 9-2320-279-10).

(2)

Turn fan control switch to an on position (low,

medium, or high) (WP 0004).

(3)

Turn temperature control switch to the coldest

position (fully clockwise) (WP 0004).

(4)

While assistant turns engine start switch ON

(TM 9-2320-279-10), check operation of AC

compressor clutch by listening for a click when

engine start switch is turned ON.

(a) If AC compressor clutch does not engage, turn

engine start switch OFF and go to Step 21 of

this fault.

(b) If AC compressor clutch engages, turn engine

start switch OFF and go to Step 3 of this fault.