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 135 of 524

TB 9-2320-279-13-1

0012-49

AC HEATER/EVAPORATOR BLOWER OPERATES BUT NO COLD AIR FROM

DUCTS DURING AC OPERATIONS - 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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HEMAC166

VOLTAGE TEST

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

medium, or high) (WP 0004).

(2) Turn engine start switch ON (TM 9-2320-279-10).

(3) Place positive (+) probe of multimeter on AC fan

control switch, terminal C (wire 1156).

(4) 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 fan control switch

(WP 0031).

Verify repair, go to Step 27 of this

fault.

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

switch OFF and go to Step 25 of this fault.