10-3930-643-10 2-10. HEATER CONTROLS. Serial     number 2001    and    above. a.   Heater    Temperature    Control    Knob. Used    to    turn    the    heater    on    and    obtain the     desired     temperature. b. Heater    fan    speed    switch. Selects the     speed     of     the     heater     fan.     The     switch has    three    positions. (1)    F o r w a r d     p o s i t i o n .    High    speed (HI). (2)    C e n t e r      p o s i t i o n .    OFF. (3)    Rear position.    LOW    speed. 2-11. DEFROSTER    FAN    SPEED    SWITCHES. Serial    number    2001    and    above.    Located    on the    two    defroster    fan    bases.    These switches    have    three    positions. a.    L e f t . High    speed. b. C e n t e r .    Off. C.    R i g h t . Low    speed. 2-12. WINDSHIELD     WIPER     CONTROL.     Serial number    2001    and    above.    Located    to    the right    of    the    instrument    console    this knob    is    the    windshield    wiper    OFF,    ON, and    speed    control. 2-13. REAR     WINDOW     WIPER     CONTROLS. Serial    number    2001    and    above.    Located above    the    rear    windows,    in    the    center, between    the    left    and    right    rear    windows. Each    knob    controls    OFF,    ON    and    wiper speed    for    the    nearest    wiper. 2-12