TM 5-2420-231-23-1
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Table 1. Heating and A/C Troubleshooting Procedures - Continued.
030
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. Heater Does Not Blow
3. Rotate heater temperature control
Little or No Air Exits From Lower Air
Warm Air When
switch (Figure 2, Item 1) to the
Vent - Proceed to Test Step 2.
Temperature Control Is
warmest setting (TM 5-2420-231-
Little or No Air Exits From Upper Air
Set to Maximum Heat -
10) and verify that warm air is exit-
Vents - Proceed to Test Step 3.
Continued
ing from air vents.
Little or No Air Exits From All Air
Vents - Replace cab air filter element
(WP 0347).
Proceed to Test Step 6.
Heater Temperature Control Is
Difficult to Rotate or Does Not Rotate
- Proceed to Test Step 4.
Heater Temperature Control Rotates
But No Warm Air Exits From Air
Vents - Proceed to Test Step 5.
Figure 2. Heater Temperature Control.
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