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
1. Heater Does Not Blow
Test Step 2. Inspect Engine Cooling
Warm When Tempera-
System
ture Control Panel Is Set
1. Turn ignition switch and battery
On Maximum Heat - Con-
disconnect switch to the OFF
tinued
position (TM 5-3805-293-10).
2. Inspect the engine coolant level
Engine Coolant Level Low - Add
(TM 5-3805-293-10).
engine coolant as required (WP
0052).
Proceed to step 5.
Engine Coolant Level OK - Proceed
to step 3.
3. Inspect cooling system for leaks.
Leaks Identified - Tighten Clamps or
Replace Cooling System Components
Perform Cooling System Inspec-
as required (WP 0036).
tion (WP 0036).
Proceed to step 5.
No Leaks - Proceed to step 4.
Water Temperature Regulator
4. Remove water temperature regu-
Obstructed or Stuck Open - Replace
lator (WP 0081) and inspect water
water temperature regulator (WP
temperature regulator for obstruc-
0081).
tion and for being stuck open.
Proceed to step 5.
Water Temperature Regulator OK -
Install water temperature regulator
(WP 0081).
Proceed to Test Step 3.
5. Operate machine until engine
reaches normal operating temper-
ature (TM 5-3805-293-10).
6. Turn HVAC blower to maximum
speed (TM 5-3805-293-10).
No Warm Air from Air Vents -
7. Turn temperature control to the
Repeat troubleshooting from the
warmest setting and verify warm
beginning.
air exiting from air vents.
Warm Air From Air Vents - Trouble-
shooting Complete.
0022-3
