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
5. Using digital multimeter, test for
Resistance 5.0 Ohms or Less -
Warm When Tempera-
continuity harness connector R-
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
Resistance should be less than
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.
Resistance More Than 5.0 Ohms -
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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