TM 5-3805-293-23-2
0022
Table 1. Cab Heating, Air Conditioning, and 12 Volt Power Inverter Troubleshooting Procedures - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
4. Refrigerant Compressor
5. Connect harness connector AW-
Will Not Engage - Con-
C4 (WP 0009, Figure 269) to
tinued
refrigerant pressure switch (WP
0009, Figure 268) (WP 0097).
6. Connect harness connector AW-
C9 (WP 0009, Figure 267) from
refrigerant low pressure switch
(WP 0009, Figure 266) (WP
0097).
7. Disconnect harness connector
AW-C11 (WP 0009, Figure 259)
from refrigerant compressor ther-
mostat pull down resistor (WP
0009, Figure 258) (WP 0098).
8. Using digital multimeter, test for
Resistance 5.0 Ohms or Less - Pro-
continuity between harness con-
ceed to step 9.
nector AW-C11 (WP 0009, Figure
Resistance More Than 5.0 Ohms -
259) terminal 2 and machine
Replace rear air conditioning wiring
ground.
harness (WP 0185).
Resistance should be less than
Proceed to step 13.
5.0 ohms.
9. Turn battery disconnect switch
and ignition switch to the ON posi-
tion (TM 5-3805-293-10).
10. Using digital multimeter, test for
Voltage 18 to 28 Volts - Proceed to
voltage between harness connec-
step 11.
tor AW-C11 (WP 0009, Figure
Voltage Less Than 18 Volts - Pro-
259) terminal 1 and machine
ceed to Test Step 9.
ground.
Voltage should be 18 to 28 volts.
11. Turn ignition switch and battery
disconnect switch to the OFF
position (TM 5-3805-293-10).
12. Using digital multimeter, test for
Resistance Less than 475 Ohms or
continuity between refrigerant
More Than 525 Ohms - Replace
compressor thermostat pull-down
refrigerant compressor pull down
resistor (WP 0009, Figure 258)
resistor (WP 0098).
terminal 1 and terminal 2.
Proceed to step 13.
Resistance should be between 475
Resistance Within 475 and 525
and 525 ohms.
Ohms - Proceed to Test Step 10.
13. Using refrigerant reclaimer, per-
form A/C Performance Test (WP
0045).
0022-36
