Table 1. Cab Heating, Air Conditioning, and 12 Volt Power Inverter Troubleshooting Procedures - Continued.
TEST OR INSPECTION
N OT E
2. Air Conditioning Does
Not Blow Cold When A/C
Always inspect the harness connectorsthat are involved in the circuit.
Is Turned On and Tem-
Poor connections can often be the cause of a problem in an electrical
perature Control Is Set
circuit. Verify that all connections in the circuit are clean and secure,
To Maximum Cool
and that all connections are in good condition. If a problem with a con-
nection is found, correct the problem and verify that this diagnostic code
is Active before performing this procedure.
Perform open or short circuit test ateach harness connection to identify
correct harness to replace.
Perform this test only if condition is active.
Test Step 1. Check for Active Diag-
1. Connect MSD (WP 0006), select
Diagnostic Code Active - Trouble-
Implement 120M and check for
shoot diagnostic code first before pro-
active diagnostic codes.
ceeding (WP 0010).
Diagnostic Code Not Active - Pro-
ceed to Test Step 2.
Test Step 2. Test Operator Climate
1. Turn fan speed switch to
HVAC Blower Motor Turns ON - Pro-
maximum speed (TM 5-3805-293-
ceed to step 2.
10) and verify HVAC blower turns
HVAC Blower Motor Does Not Turn
ON - Diagnose HVAC blower motor
first. Refer to HVAC Blower Does Not
Turn On In One or More Speeds in
2. Operate machine until engine
reaches normal operating temper-
ature (TM 5-3805-293-10).
3. Turn temperature control to the
No Cool Air from Air Vents - Pro-
coolest setting, turn the A/C
ceed to Test Step 3.
switch to the ON position (TM 5-
Cool Air From Air Vents - Trouble-
3805-293-10) and verify cool air
exiting from air vents.