TB 9-2320-360-13&P-1
WARN I N G
Jewelry can catch on equipment and cause injury or short across electrical circuit and cause severe
burns or electrical shock. Remove rings, bracelets, watches, necklaces, and any other jewelry before
working around HET Tractor.
A/C circuit breaker, A/C relay, and 24 vdc magnetic switch (R22) are always electrically hot and can
cause severe injury to personnel. Care must be exercised when working around these components.
VOLTAGE TEST
(1) Remove two screws and doghouse
door (WP 0028 00).
(2) Disconnect A/C switch harness
evaporator connector.
(3) Turn engine switch to ON position
(TM 9-2320-360-10).
(4) Turn A/C control switch to medium
blower speed (center) position
(WP 0008 00).
(5) Place positive (+) probe of multimeter
on yellow wire at A/C switch harness
connector.
(6) Place negative (-) probe of multimeter
on ground.
(a) If 22 to 28 vdc are not measured,
turn engine switch to OFF position
and go to Step 11 of this fault.
(b) If 22 to 28 vdc are measured, turn
engine switch to OFF position and
repair A/C evaporator harness
yellow wire (See WP 0057 00, Fig
j) or replace evaporator harness
(WP 0027 00). Verify repair, go to
Step 18 of this fault.
CONTINUITY TEST
(1) Disconnect A/C switch harness
connector from A/C control switch.
(2) Set A/C control switch to medium
blower speed (center) position
(WP 0008 00).
(3) Set multimeter switch ohms.
(4) Is there continuity measured across A/
C control switch medium blower speed
contacts?
(a) If there is no continuity, replace A/
C control switch (WP 0021 00).
Verify repair, go to Step 18 of this
fault.
(b) If there is continuity repair A/C
switch harness yellow wire (See
HETF00221
WP 0057 00, Fig j). Verify repair,
go to Step 18 of this fault.
0016 00-13
