TM 5-2420-231-23-1
0032
Table 1. A/C Compressor Does Not Operate - Continued.
032
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
6. Remove front console (WP 0174)
A/C Compressor Does Not
and A/C pressure relay (WP 0007,
Operate - Continued
Figure 53).
7. Using a digital multimeter, mea-
Resistance 5.0 Ohms or Less -
sure resistance between A/C pres-
Replace front console options wiring
sure relay (WP 0007, Figure 53)
harness (WP 0163).
terminals 30 and 87a. Resistance
Proceed to Test Step 9.
should be 5.0 ohms or less.
Resistance Greater Than 5.0 Ohms -
Replace A/C pressure relay (WP 0007,
Figure 53).
Proceed to Test Step 9.
Test Step 8. Test A/C High-Pressure
Switch.
1. Turn ignition switch to the off posi-
tion (TM 5-2420-231-10) and dis-
connect batteries (WP 0157).
2. Remove radiator screen from
machine (WP 0304).
3. Disconnect chassis options wiring
harness connector (WP 0007, Fig-
ure 40) from A/C high-pressure
switch (WP 0007, Figure 41).
4. Using a digital multimeter, test for
Continuity - Replace A/C high-
continuity between A/C high-pres-
pressure switch (WP 0363).
sure switch (WP 0007, Figure 41)
Proceed to Test Step 9.
terminals A and B. There should
No Continuity - Replace A/C pressure
be no continuity.
relay (WP 0007, Figure 53).
Proceed to Test Step 9.
Test Step 9. Verify That Symptom Is
Resolved.
1. Connect all wiring harness con-
nectors.
2. Install side cover and five new fas-
teners (WP 0346).
3. Connect batteries (WP 0157).
4. Verify A/C system performance
(WP 0364).
5. Monitor and record low-pressure
A/C Performance Test OK -
Troubleshooting complete.
and high-pressure gauge read-
ings.
A/C Performance Test Not OK -
Repeat troubleshooting from the
beginning.
END OF WORK PACKAGE
0032-13/(14 blank)