INSTRUMENT PANEL (Cont).
Control or Indicator
Vent air into cab from heater/ventilator/defroster
and air conditioner, if equipped. Louvered openings
Indicates air cleaner air flow is adequate if gage is
clear. If restricted, indicator window will show up to
20 inches of water. Push yellow reset button to reset
after air cleaner has been serviced.
Main Light Switch
Five-position switch. Operates the same as main
(All Except M915A2
light switch on other model trucks. Refer to item 16
in subparagraph a(3).