TM 9-8000
Figure 17-32. Vacuum-Operated Mode Doors
b. Interior Heaters. Auxiliary heaters also are used to
(2) Supplemental Hot Water Heaters. These
heaters contain a fan motor and a heater core (para 17-
heat the vehicle's interior compartments. There are two
19). They are connected to the englne's cooling system
basic types.
and operate by the same principles as the vehicle's main
(1) Self-contained. These usually are pro- pane
heater.
or butane space heaters. For portable shelters, an
electric-type space heater will be used. This type of
heater requires an external power supply.
17-25