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 77 of 524
TB 9-2320-279-13-1
0011-9
AC HEATER/EVAPORATOR BLOWER DOES NOT OPERATE IN ALL SPEEDS
(LOW, MEDIUM, AND HIGH) - 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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HEMAC131
VOLTAGE TEST
(1) Disconnect fan control switch harness connector
(WP 0031).
(2) Turn engine start switch ON (TM 9-2320-279-10).
(3) Turn fan control switch to low speed position
(WP 0004).
(4) Place positive (+) probe of multimeter on red wire at
fan control switch harness connector, terminal 1.
(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 go to Step 8 of this fault.
(b) If 22 to 28 vdc are measured, turn engine start
switch OFF and go to Step 7 of this fault.
CONTINUITY TEST
(1) Disconnect AC heater/evaporator blower motor
resistor harness connector from AC heater/
evaporator blower motor resistor (WP 0036).
(2) Set multimeter switch to ohms.
(3) Place positive (+) probe of multimeter on AC heater/
evaporator blower motor resistor harness red wire
at AC heater/evaporator blower motor resistor
connector.
(4) Place negative (-) probe of multimeter on AC
heater/evaporator blower motor resistor harness red
wire at fan control switch harness connector,
terminal 1.
(a) If there is no continuity, repair AC heater/
evaporator blower motor resistor harness red
wire (see Appendix A) or replace AC heater/
evaporator blower motor resistor harness
(WP 0036).
Verify repair, go to Step 15 of this
fault.
(b) If there is continuity, replace AC heater/
evaporator blower motor resistor (WP 0035).
Verify repair, go to Step 15 of this fault.
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