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
7. Using digital multimeter, test for
Resistance 5.0 Ohms or Less -
Will Not Engage - Con-
continuity between each terminal
Replace cab lower wiring harness
tinued
on evaporator temperature switch
(WP 0188).
sensing bulb.
Proceed to step 8.
Resistance should be less than
Resistance More Than 5.0 Ohms -
5.0 ohms.
Replace evaporator temperature
switch sensing bulb (WP 0294).
Connect rear chassis wiring harness
connector FA-C35 (WP 0009, Figure
15) to cab lower wiring harness con-
nector P-C70 (WP 0009, Figure 16)
(WP 0188).
Connect harness connector P-C16
(WP 0009, Figure 273) to harness
connector CM-C1 (WP 0009, Figure
272) (WP 0294).
Proceed to step 8.
8. Using refrigerant reclaimer, per-
form A/C Performance Test (WP
0045).
9. Monitor and record low pressure
A/C Performance Test OK - Remove
and high pressure gauges.
A/C Refrigerant Reclaimer. Trouble-
shooting complete.
A/C Performance Test Not OK -
Repeat troubleshooting from the
beginning.
Test Step 10. Test Thermostatic
Switch Circuits 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).
2. Using digital multimeter, test for
Resistance 5.0 Ohms or Less - Pro-
continuity between harness con-
ceed to step 3
nector FA-C35 (WP 0009, Figure
Resistance More Than 5.0 Ohms -
15) terminal 18 and harness con-
Replace rear chassis wiring harness
nector FA-C32 (WP 0009, Figure
(WP 0188).
262) terminal 1.
Proceed to step 8.
Resistance should be less than
5.0 ohms.
0022-38
