TM 10-3930-675-20-1 0006 00-13 TROUBLESHOOTING PROCEDURES (NON-ERROR CODE) - CONTINUED 0006 00 Table 2. Electrical Troubleshooting Procedures (Non-Error Code) - Continued. MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 18. 12-V Utility Plug Not Working - Continued. 4.  Inspect    12-V    utility    plug wiring harnesses and connectors for damage, continuity, and proper voltage (12V) (WP 0199 00-40). Repair or replace damaged wires or connectors (WP 0111 00). CAB HEATER/DEFROSTER, AIR CIRCULATION, AND AC SYSTEM 19.  Blower Motor Not Working. 1.  Ensure    that    blower    motor circuit  breaker  number  11  is not tripped. Reset circuit breaker as required (WP 0073 00). 2.  Check  heater  blower  control switch for damage and continuity. Replace   damaged   switch   (WP 0072 00). 3.  Check  air  circulation  blower control switch for damage and continuity. Replace   damaged   switch   (WP 0072 00). 4.  Disconnect blower motor wiring harness, located behind instrument panel lower panel, and check for proper voltage. Voltage should be 24V. If  voltage  is  not  as  specified, replace blower motor (WP 0159 00) 20. Heater/Defroster Producing Low or No Heat. 1.  Ensure  that  engine  is  up  to operating temperature. Refer to TM 10-3930-675-10. 2.  Check coolant level in recovery  tank  (TM  10-3930- 675-10). Add coolant as required (TM 10- 3930-675-10). 3.  Check   heater/defroster   tem- perature   control   switch   for damage and continuity. Replace   damaged   switch   (WP 0072 00). 21. AC System Producing Low or No Cool Air. 1.  Ensure   that   AC   condenser circuit breaker number 1 is not tripped. Reset circuit breaker as required (WP 0073 00). 2.  Remove    engine    cover    and inspect  AC  compressor  drive belts for damage. a.  Replace and/or adjust belts as required (WP 0189 00). b.  Notify   DS   Maintenance   to service AC system. 3.  Check AC temperature control switch for damage and continuity. Replace   damaged   switch   (WP 0072 00).