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 159 of 524

TB 9-2320-279-13-1

0014-9

AC COMPRESSOR DOES NOT SHUT OFF OR CYCLES CONSTANTLY - Continued

DRAFT

WARNING

Remove rings, bracelets, wristwatches, neck chains, and any other jewelry before working around

vehicle.

Jewelry can catch on equipment and cause serious injury.

Jewelry or tools may short

across electrical circuits or terminals and cause damage to equipment or severe burns or

electrical shock to personnel.

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HEMAC172

VOLTAGE TEST

(1) If OFF, turn engine start switch ON

(TM 9-2320-279-10).

(2) Place positive (+) probe of multimeter on AC

condenser assembly harness black wire at AC

condenser motor solenoid terminal.

(3) Place negative (-) probe of multimeter on a known

good ground.

(a) If 22 to 28 vdc are not measured, turn engine

start switch OFF and go to Step 10 of this fault.

(b) If 22 to 28 vdc are measured, go to Step 7 of

this fault.

VOLTAGE TEST

(1) Turn fan control switch to an on position (low,

medium, or high) (WP 0004).

(2) Turn AC temperature control switch to the coldest

position (fully clockwise) (WP 0004).

(3) Turn engine start switch ON

(TM 9-2320-279-10).

(4) Place positive (+) probe of multimeter on AC

condenser motor solenoid, terminal red wire.

(5) Place negative (-) probe of multimeter on a known

good ground.

(a) If 22 to 28 vdc are not measured, turn engine

start switch OFF and replace AC condenser

motor solenoid (WP 0027).

Verify repair, go to

Step 14 of this fault.

(b) If 22 to 28 vdc are measured, turn engine start

switch OFF and go to Step 8 of this fault.