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
3. Blower Motor Does Not
14. Using digital multimeter, test for
Voltage 18 to 26 Volts - Replace
Turn On In One or More
voltage between harness connec-
blower resistor (WP 0294).
Speeds - Continued
tor C (WP 0009, Figure 402) and
Voltage Less Than 18 Volts -
machine ground.
Replace climate control panel (WP
Voltage should be 18 to 26 volts.
0293).
Proceed to step 15.
15. Rotate fan speed switch through
HVAC Blower Motor Turns ON In
each position (TM 5-3805-293-10)
Each Speed - Troubleshooting com-
and verify HVAC blower turns on
plete.
in each position.
HVAC Blower Motor Does Not Turn
ON In One Or More Speeds - Repeat
troubleshooting from beginning.
Test Step 6. Test Climate Control
Panel and High Speed Fan Circuit.
1. Turn ignition switch and battery
disconnect to the OFF position
(TM 5-3805-293-10).
2. Remove HVAC blower relay (WP
0009, Figure 397) from cab fuse
panel (TM 5-3805-293-10).
3. Turn battery disconnect switch
and ignition switch to the ON posi-
tion (TM 5-3805-293-10).
4. Using digital multimeter, test for
Voltage 18 to 26 Volts - Proceed to
voltage between HVAC blower
step 5.
relay socket terminal C18 (WP
Voltage Less Than 18 Volts - Pro-
0009, Figure 398) and machine
ceed to step 6.
ground.
Voltage should be 18 to 26 volts.
5. Using digital multimeter, test for
Voltage 18 to 26 Volts - Replace
voltage between HVAC blower
HVAC blower relay (WP 0009, Figure
relay socket terminal C18 (WP
398).
0009, Figure 398) and E17.
Proceed to step 19.
Voltage should be 18 to 26 volts.
Voltage Less Than 18 Volts - Pro-
ceed to step 6.
6. Turn ignition switch and battery
disconnect switch to the OFF
position (TM -5-3805-293-10).
0022-23
