TM 5-2420-231-23-1
0030
Table 1. Heating and A/C Troubleshooting Procedures - Continued.
030
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
2. A/C Does Not Blow Cold
8. Monitor and record low-pressure
Low- and High-Pressure Gauge
Air When A/C
and high-pressure gauge read-
Readings Above Normal - Turn
Temperature Control Is
ings.
ignition switch to the off position (TM 5-
Set to Maximum Cold -
2420-231-10).
Continued
Proceed to Test Step 5.
Low-Pressure Gauge Reading
Above Normal and High-Pressure
Gauge Reading Below Normal - Turn
ignition switch to the off position (TM 5-
2420-231-10).
Proceed to Test Step 6.
Low- and High-Pressure Gauge
Readings Below Normal - Turn
ignition switch to the off position (TM 5-
2420-231-10).
Proceed to Test Step 7.
Low-Pressure Gauge Reading
Normal and High-Pressure Gauge
Reading Above Normal - Turn ignition
switch to the off position (TM 5-2420-
231-10).
Proceed to Test Step 8.
Test Step 5. Low- and High-Pressure
Gauge Readings Above Normal.
1. A/C system is overcharged.
Evacuate and Recharge A/C System
- Evacuate and recharge A/C system
(WP 0364).
Proceed to step 2.
2. Perform A/C performance test (WP
0364).
3. Monitor and record low-pressure
A/C Performance Test OK - Proceed
and high-pressure gauge read-
to Test Step 9.
ings.
Low- and High-Pressure Gauge
Readings Remain Above Normal -
A/C expansion valve is not opening
completely. Replace A/C expansion
valve (WP 0358).
Proceed to Test Step 9.
0030-28