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Page Title: AIR CONDITIONER FAILS TO HEAT
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TM 5-4120-361-14 Table  4-2. Troubleshooting - Continued MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 8. AIR CONDITIONER FAILS TO HEAT - Continued Step 5. Inspect for defective heater high temperature cutout thermostatic switch. Replace defective thermostatic switch (para 4-31). Step 6. Test for defective heater relay. Relay defective relay (para 4-27). Step 7. Inspect and test for defective heaters and associated wiring. Tighten connections and repair damaged wiring. Replace defective heaters (para 4-30). Step 8. Test for defective evaporator fan motor. Replace motor (para 4-21). 9. EXCESSIVE NOISE Step  1. Check evaporator fan or condenser fan for loose blade or loose mounting. Tighten fan blade on motor shaft. Tighten all mounting hardware. Step  2. Test for defective or worn evaporator or condenser fan motor. Replace worn or defective motor (para 4-21 and 4-23). Step 3. Check to see if compressor knocks or chatters. Stop air conditioner and report condition to direct support maintenance. 4-14

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