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TM 5-4210-220-12
Table 4-2 UNIT TROUBLESHOOTING - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1d CAB CIRCULATING FAN NOT OPERATING
Step 1. Failed motor.
Replace motor.
Step 2. Failed switch, wires, or circuit breaker.
Replace failed component.
1e WINDSHIELD WASHER INOPERATIVE
Step 1. Wash reservoir empty.
Refill reservoir.
Step 2. Leaking air line/no air pressure.
a. Check and tighten air lines.
b. Wait until secondary air at 85 psi (590 kPa).
Step 3. Leaking water line.
Check and tighten water lines.
Step 4. Plugged nozzles on wiper arm.
Clean or replace nozzles.
Step 5. Faulty control valve.
Replace control valve, (see para. 4-24).
1f WINDSHIELD WIPERS WILL NOT RUN
Step 1. Leaking air lines/no air pressure.
a. Check and tighten air lines.
b. Wait until secondary air at 85 psi (590 kPa).
Step 2. Motor failed.
Replace motor, (see para. 4-12).
Step 3. Linkages tight, bent, or corroded.
Replace wiper arm, or free up as required, (see para. 4-12).
4-22
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