TM 5-2410-240-23-1
0021
Table 1. Cab Troubleshooting Without Codes. - Continued.
0021
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
3. Air Conditioning Does Not Blow
Test Step 4. Low Pressure
Cold When Maximum Cooling is
Gauge is Above Normal and
Selected - Continued
High Pressure Gauge is Below
Normal.
Low Pressure Gauge and High
Verify low pressure gauge and
Pressure Gauge are the Same
high pressure gauge are the same
Pressure - Refrigerant compres-
pressures.
sor is not engaging; proceed to
Test Step 10.
Low Pressure Gauge and High
Pressure Gauge are Not the
Same Pressure - Replace A/C
compressor (WP 0092).
Proceed to Test Step 9.
Test Step 5. Low Pressure
Gauge is Below Normal and
High Pressure Gauge is Above
Normal
Orifice tube or receiver/dryer is
Replace Orifice Tube and
damaged or restricted.
Receiver/Dryer (WP 0248).
Proceed to Test Step 9.
Test Step 6. Low Pressure
Gauge and High Pressure
Gauge are Both Below Normal.
Test A/C system for leaks
No Leaks Found - Air is in the A/C
(WP 0032).
system. Evacuate and recharge
A/C system (WP 0254).
Proceed to Test Step 9.
Leaks Found - Repair or replace
leaking A/C component.
Proceed to Test Step 9.
Test Step 7. Low Pressure
Gauge is Normal and High Pres-
sure Gauge is Below Normal.
1. Low pressure hose is
Restricted Hose - Replace low
restricted.
pressure A/C hose (WP 0248).
2. Monitor and record low pres-
Low Pressure Gauge is Normal
sure and high pressure gauge
and High Pressure Gauge
readings.
Remains Below Normal -
Replace refrigerant compressor
(WP 0092).
Proceed to Test Step 9.
0021-59
