TM 9-2320-273-20
2-58. VENTILATING SYSTEM.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
NOTE
The driver’s fresh air vent is a manually
operated unit mounted in the lower cowl
side of the cab. It is not serviced at the
organizational level.
HEAT CONTROL KNOB. Allows driver to heat cab, Connected by cable to water control
valve.
FAN CONTROL SWITCH. Allows driver to control amount of heat in cab. Connected
by electrical wires to heater motor.
DRIVER HEAT KNOB. Allows driver to open or close heat vent for his side of cab.
Connected by cable to heat control lever.
PASSENGER HEAT KNOB. Allows passenger to open or close heat vent for his side
of cab. Connected by cable to heat control lever.
FRESH VENT CONTROL KNOB. Allows driver to control fresh air vent on passenger
side. Connected by cable to vent control lever.
RECIRCULATION VENT CONTROL KNOB. Allows driver to recirculate cab air
through heater. Connected by cable to recirculation control lever.
WATER CONTROL VALVE. Allows flow of water through heater core. Actuated
by cable from heat control knob.
HEATER MOTOR. Drives fan for distributing heat. Actuated by fan control
switch.
HEAT CONTROL LEVER. Actuates flap at heat vent for passenger. Connected by
cable to passenger pull knob.
HEAT CONTROL LEVER. Actuates flap at heat vent for driver. Connected by cable
to driver pull knob.
RECIRCULATION CONTROL LEVER. Actuates shutter inside heater. Connected by
cable to recirculation vent control knob.
FRESH VENT CONTROL LEVER. Actuates shutters at fresh air vent. Connected by
cable to fresh vent control knob.
2-64
