TB 9-2320-302-13&P-3
A/C TROUBLESHOOTING PROCEDURES - CONTINUED
0013 00
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
A/C ELECTRICAL SYSTEM - CONTINUED
Evaporator Assembly Works But 1. Verify operation of engine fan pressure
3.
switch on receiver/dryer.
Engine Fan Does Not.
(a) Start engine (TM 9-2320-363-10).
(b) Set A/C fan switch to the ON
position (WP 0004 00).
(c) Disconnect engine fan pressure
switch connector on receiver/dryer
(connector with purple and red
wires) (WP 0019 00).
(d) Install jumper wire across engine
fan switch connector.
(e) Verify engine fan operation.
1. If engine fan does not operate,
proceed to step 3.
2. If engine fan operates, proceed to
next step.
2. Verify A/C system pressures (WP 0015
1. If system is operating within
normal parameters, replace
pressure switch (WP 0019 00).
2. If system is not operating within
normal parameters, inspect system
for leaks (WP 0015 00).
3. Verify continuity on purple wire to
engine fan pressure switch.
(a) Turn ignition key switch to the OFF
position (TM 9-2320-363-10).
(b) Set A/C fan switch to the OFF
position (WP 0004 00).
(c) Disconnect engine fan pressure
switch connector on receiver/dryer
(connector with purple and red
wires) (WP 0019 00).
(d) Disconnect purple wire from
engine coolant temperature switch
(e) Check continuity from purple wire
1. If continuity is not indicated,
terminal on engine fan pressure
repair or replace purple wire.
switch and purple wire terminal
2. If continuity is indicated, repair or
removed from engine coolant
replace red wire.
temperature switch.
