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
18. Monitor and record low pressure
A/C Performance Test OK - Remove
Will Not Engage - Con-
and high pressure gauges.
A/C Refrigerant Reclaimer. Trouble-
tinued
shooting complete.
A/C Performance Test Not OK -
Repeat troubleshooting from the
beginning.
Test Step 4. Test Refrigerant Com-
pressor Clutch Voltage Circuit In
Rear Chassis Wiring Harness
1. Disconnect rear air conditioning
wiring harness connector AW-C1
(WP 0009, Figure 263) from rear
chassis wiring harness connector
FA-C32 (WP 0009, Figure 262)
(WP 0185).
2. Using digital multimeter, test for
Voltage Less than 18 Volts -
voltage between harness connec-
Replace rear chassis wiring harness
tor FA-C32 (WP 0009, Figure
(WP 0188).
262) terminal 3 and machine
Connect harness connector AW-C2
ground.
(WP 0009, Figure 261) to A/C com-
Voltage should be between 18 and 26
pressor clutch solenoid (WP 0009,
volts.
Figure 260) (WP 0185).
Connect rear air conditioning wiring
harness connector AW-C3 (WP 0009,
Figure 265) to refrigerant compressor
arc suppressor (WP 0009, Figure
264) (WP 0098).
Connect rear air conditioning wiring
harness connector AW-C9 (WP 0009,
Figure 267) to refrigerant compressor
low pressure switch (WP 0009, Figure
266) (WP 0097).
Proceed to step 3.
Voltage Between 18 and 26 Volts -
Replace rear air conditioning wiring
harness (WP 0185).
Proceed to step 3.
3. Using refrigerant reclaimer, per-
form A/C Performance Test (WP
0045).
0022-31
