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 low blower
speed (counter-clockwise) position
(WP 0008 00).
(5) Place positive (+) probe of multimeter
on wire RED #1 at A/C switch harness
connector.
(6) Place negative (-) probe of multimeter
on ground.
(a) If 22 to 28vdc are not measured,
turn engine switch to OFF position
and go to Step 8 of this fault.
(b) If 22 to 28vdc are measured, turn
engine switch to OFF position and
go to Step 7 of this fault.
CONTINUITY TEST
(1) Remove A/C evaporator subsystem
(WP 0036 00).
(2) Remove A/C blower from evaporator
assembly (WP 0022 00).
(3) Set multimeter switch to Ohms.
(4) Is continuity measured on wire RED #1
from A/C evaporator harness switch
harness connector to A/C blower
resistor?
(a) If there is no continuity, repair A/C
evaporator harness wire RED #1
(See WP 0057 00, Fig j) or replace
A/C evaporator harness (WP 0027
00). Verify repair, go to Step 18 of
this fault.
HETF00219
(b) If there is continuity, replace A/C
blower resistor (WP 0023 00).
Verify repair, go to Step 18 of this
fault.
0016 00-9
