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 65 of 524
TB 9-2320-279-13-1
0010-9
AC HEATER/EVAPORATOR BLOWER DOES NOT OPERATE - 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.
•
Circuit breakers No. 4, 5, 6, and 10 are always electrically live and can cause severe injury to
personnel.
Care must be taken when working around these circuit breakers.
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HEMAC139
CONTINUITY TEST
(1) Set multimeter switch to ohms.
(2) Place positive (+) probe of multimeter on AC heater/
evaporator blower motor case.
(3) Place negative (-) probe of multimeter on a known
good ground.
(a) If there is no continuity, repair AC heater/
evaporator blower motor ground wire (see
Appendix A) or replace AC heater/evaporator
blower motor (WP 0034).
Verify repair, go to
Step 9 of this fault.
(b) If there is continuity, replace AC heater/
evaporator blower motor assembly (WP 0034).
Verify repair, go to Step 9 of this fault.
VOLTAGE TEST
(1) Place positive (+) probe of multimeter on wire 1640
at circuit breaker No. 11.
(2) Place negative (-) probe of multimeter on a known
good ground.
(a) If 22 to 28 vdc are not measured, go to Step 8 of
this fault.
(b) If 22 to 28 vdc are measured, turn engine start
switch OFF and replace circuit breaker No. 11
(WP 0017).
Verify repair, go to Step 9 of this
fault.
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