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49.  HEATER DOES NOT OPERATE OR WILL NOT CHANGE SPEEDS (CONT) - TM-9-2320-364-20-2_820
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49.  HEATER DOES NOT OPERATE OR WILL NOT CHANGE SPEEDS (CONT) - TM-9-2320-364-20-2_822
TM 9-2320-364-20-2      2-1597 (1)   Remove six screws, lockwashers, washers and heater cover.  Discard lockwashers. (2)   Connect positive (+) multimeter lead to orange wire at heater motor harness splice. (3)   Connect negative (–) multimeter lead to a known good ground. (4)   Turn ON ENGINE switch (TM 9-2320-364-10). (5)   Turn fan control switch to high. (a)   If 22 to 28 vdc are not present, perform Step (5) below and repair or replace orange wire (see schematic Fig 2-42). (b)   If 22 to 28 vdc are present, orange wire is OK. (6)   Turn off fan control switch. (7)   Turn OFF ENGINE switch. VOLTAGE TEST Remove all jewelry such as rings, dog tags, bracelets, etc.  If jewelry or tools contact positive electrical circuits, a direct short may result.  Damage to equipment, injury or death to personnel may occur. (1)   Set multimeter select switch to ohms. (2)   Is there continuity measured between heater motor casing and known good ground? (a)   If there is no continuity, repair or replace ground wire (Para 19-13). (b)   If there is continuity, replace heater motor (Para 19-13). (3)   Install heater cover, six washers, lockwashers and screws. (4)   Install heater compartment panel and eight screws. CONTINUITY TEST

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