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 63 of 524
TB 9-2320-279-13-1
0010-7
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.
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HEMAC138
VISUAL INSPECTION
(1) Remove four screws, washers, lockwashers, and
cover from AC heater/evaporator assembly
(WP 0035).
(2) Check fan control switch and AC heater/evaporator
blower motor resistor harness for damaged wires
and loose connection.
(a) If wires are damaged, repair wires (see
Appendix A) or replace fan control switch
harness (WP 0031) or AC heater/evaporator
blower motor resistor harness (WP 0036) as
required.
Verify repair, go to Step 9 of this fault.
(b) If harness connector is loose, connect
connector.
Verify repair, go to Step 9 of this
fault.
(c) If harness is free from damage and loose
connections, go to Step 5 of this fault.
CONTINUITY TEST
(1) Disconnect AC heater/evaporator blower motor
power wire at splice (WP 0034).
(2) Set multimeter switch to ohms.
(3) Place positive (+) probe of multimeter on AC heater/
evaporator blower motor power wire at AC heater/
evaporator blower motor resistor.
(4) Place negative (-) probe of multimeter on AC
heater/evaporator blower motor power wire at
splice.
(a) If there is no continuity, repair AC heater/
evaporator blower motor power wire (see
Appendix A) or replace AC heater/evaporator
blower motor resistor harness (WP 0036).
Verify repair, go to Step 9 of this fault.
(b) If there is continuity, connect AC heater/
evaporator blower power wire at splice and go
to Step 6 of this fault.
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