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
Resistance 5.0 Ohms or Less -
Warm When Tempera-
Replace cab upper wiring harness
ture Control Panel Is Set
C1 (WP 0009, Figure 32) terminal
(WP 0265).
On Maximum Heat - Con-
29 and harness connector P-C16
Connect harness connector CM-C1
tinued
(WP 0009, Figure 273) terminal 5.
(WP 0009, Figure 272) to harness
connector P-C16 (WP 0009, Figure
5.0 ohms.
273).
Connect cab lower wiring harness
harness connector CM-C7 (WP 0009,
Figure 271) to water valve actuator
(WP 0009, Figure 270) (WP 0294).
Proceed to step 6.
Replace cab lower wiring harness
(WP 0266).
Proceed to step 6.
6. Operate machine until engine
reaches normal operating temper-
ature (TM 5-3805-293-10).
7. Turn fan speed switch to maxi-
mum speed (TM 5-3805-293-10).
8. Turn temperature control to the
No Warm Air From Air Vents -
warmest setting and verify warm
Repeat troubleshooting from the
air exiting from air vents.
beginning.
Warm Air From Air Vents - Trouble-
shooting Complete.
Test Step 6. Test Water Valve Actu-
ator Signal Circuit.
1. Disconnect upper cab wiring
harness connector R-C22 (WP
0009, Figure 386) from HVAC
control panel (WP 0009, Figure
385) (WP 0265).
2. Disconnect harness connector R-
C1 (WP 0009, Figure 31) from
harness connector P-C3 (WP
0009, Figure 34).
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