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
2. Air Conditioning Does
Test Step 10. Low Pressure Gauge
Not Blow Cold When A/C
is Normal, and High Pressure
Is Turned On and Tem-
Gauge Bounces, or Gauge is
perature Control Is Set
Unsteady.
To Maximum Cool - Con-
N OT E
tinued
Low pressure gauge may drop into vacuum range during the test
Air flow from evaporator is very cold, but will become warm when low
pressure gauge drops into vacuum.
1. Test A/C system for leaks (WP
No Leaks Found - Air is in the A/C
0295).
system. Evacuate and recharge A/C
system (WP 0295).
Proceed to Test Step 11.
Leaks Found - Repair or Replace
leaking A/C component (WP 0295).
Proceed to Test Step 11.
Test Step 11. Perform A/C perfor-
mance test and verify A/C system
operation.
1. Using refrigerant reclaimer, per-
form A/C Performance Test (WP
0045).
2. Monitor and record low pressure
A/C Performance Test OK - Proceed
gauge and high pressure gauge.
to step 3.
A/C Performance Test Not OK -
Troubleshooting complete.
3. Turn fan speed switch to maxi-
No Cool Air From Air Vents -
mum speed and temperature con-
Remove AC Refrigerant Reclaimer
trol to the coolest setting. Turn the
and repeat troubleshooting from the
A/C switch to the ON position (TM
beginning.
5-3805-293-10) and verify cool air
Cool Air From Air Vents - Trouble-
exiting from air vents.
shooting Complete.
0022-14
