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
9. Using digital multimeter, test for
Resistance 5.0 Ohms or Less - Pro-
Will Not Engage - Con-
continuity between harness con-
ceed to Test Step 6.
tinued
nector AW-C4 (WP 0009, Figure
Resistance More Than 5.0 Ohms -
269) terminal 2 and harness con-
Replace rear air conditioning wiring
nector AW-C1 (WP 0009, Figure
harness (WP 0185).
263) terminal 4.
Proceed to step 10.
Resistance should be less than
5.0 ohms.
10. Using refrigerant reclaimer, per-
form A/C Performance Test (WP
0045).
A/C Performance Test OK - Remove
11. Monitor and record low pressure
and high pressure gauges.
A/C Refrigerant Reclaimer. Trouble-
shooting complete.
A/C Performance Test Not OK -
Repeat troubleshooting from the
beginning.
Test Step 6. Test Refrigerant Pres-
sure Switches
1. Turn ignition switch and battery
disconnect switch to the OFF
position (TM 5-3805-293-10).
2. Remove jumper wire from har-
ness connector AW-C9 (WP
0009, Figure 261) terminal 1 and
terminal 2.
3. Using digital multimeter, test for
Resistance 5.0 Ohms or Less - Pro-
continuity between refrigerant low
ceed to step 4.
pressure switch (WP 0009, Figure
Resistance More Than 5.0 Ohms -
266) terminal 1 and terminal 2.
Proceed to Test Step 7.
Resistance should be less than
5.0 ohms.
4. Using digital multimeter, test for
Resistance 5.0 Ohms or Less - Pro-
continuity between refrigerant
ceed to Test Step 8.
pressure switch (WP 0009, Figure
Resistance More Than 5.0 Ohms -
268) terminal 1 and terminal 2.
Proceed to Test Step 7.
Resistance should be less than 5.0
ohms.
Test Step 7. Test Refrigerant Com-
pressor Clutch Arc Suppressor
1. Using digital multimeter, test for
continuity between refrigerant
compressor arc suppressor (WP
0009, Figure 264) terminal 1 and
terminal 2.
Monitor and record resistance.
0022-33
