TM 5-3805-298-23-1
0117
Table 1. Heater Does Not Blow Warm Air When Temperature Control Panel Is Set on Maximum Heat.
0117
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Test Step 1. Test Fan Operation.
Heater Does Not Blow Warm
1. Turn battery disconnect switch and
Air When Temperature
ignition switch to ON position
Control Panel Is Set on
(TM 5-3805-298-10).
Maximum Heat
2. Turn heater A/C switch to heater
ON position (TM 5-3805-298-10).
3. Turn blower switch to I, II, and III
Blower Fan Operates in All Three
Speeds Proceed to Test Step 2.
(TM 5-3805-298-10) and test
output of blower fan.
Blower Fan Does Not Operate in One
or More Speeds Troubleshoot blower
fan (WP 0119).
Test Step 2. Inspect Heater Control
Valve Linkage.
1. Turn the ignition switch to the OFF
position (TM 5-3805-298-10).
2. While rotating heater control knob
Cable and Attaching Bolt OK
(Figure 1, Item 2) towards the
Proceed to step 3.
large red area (Figure 1, Item 1)
Cable Has Sharp Bends or Damaged
inspect cab temperature control
- Replace cab temperature control
cable (Figure 1, Item 5) for
cable (WP 0408).
damage, sharp bends, and loose
Proceed to Test Step 6.
cable attaching bolt
Cable Attaching Bolt Loose - Tighten
(Figure 1, Item 6).
cable attaching bolt, proceed to step 3.
3. While rotating heater control knob
Cable Pulls Heater Control Valve
(Figure 1, Item 2) towards the
Open Proceed to Test Step 3.
large red area (Figure 1, Item 1)
Cable Detached or Broken from
observe cab temperature control
Heater Control Valve Repair or
cable attachment
replace cab temperature control cable
(Figure 1, Item 4) pulling the
(WP 0408).
heater control valve
Proceed to Test Step 6.
(Figure 1, Item 3) open.
Cable Attached and Moving but
Heater Control Valve Does Not Move
- Replace heater control valve
(WP 0407).
Proceed to Test Step 6.
