TM 5-2420-231-23-1
0030
Table 1. Heating and A/C Troubleshooting Procedures.
0030
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. Heater Does Not Blow
Test Step 1. Verify Correct Operation
Warm Air When
of Heating, Ventilation, and Air
Temperature Control Is
Conditioning (HVAC) Blower Motor
Set to Maximum Heat
and Heater.
1. Start and operate machine until
engine reaches normal operating
temperature (TM 5-2420-231-10).
2. Turn blower fan switch (Figure 1,
HVAC Blower Motor Operates at
Item 1) to each speed setting (TM
Each Setting - Proceed to step 3.
5-2420-231-10) and verify that
HVAC Blower Motor Does Not
HVAC blower motor operates at
Operate at One or More Speeds -
each position.
Diagnose HVAC blower motor (WP
0031) and then proceed to Test Step 6.
HVAC Blower Motor Does Not
Operate at Any Speed - Diagnose
HVAC blower motor (WP 0031) and
then proceed to Test Step 6.
Figure 1. Blower Fan Switch.
0030