16
HEATERS
The bus may also have a step heater. This heat is controlled by the FORD or GM
controls on the dash.
The rear heaters are usually located under a passenger seat, on the back or side wall and
are controlled by a switch located on the console switch panel. For maintenance
purposes, the shut off valves need to be closed and wiring disconnected before
proceeding to any verification.
Valve heaters can be opened and closed manually from underneath the bus. The vehicle
can also be equipped with a mechanical valve activated from the inside of the vehicle to
the left of the console, underneath the dash (go to page 7 for location of release cable) or
with an electrical control valve activated by a switch in the console.
Another option which might be present under the bus is a bleeder valve. If your vehicle
has such equipment, it will be located towards the rear of the vehicle right after the
manual valves.
Manual valves
Mechanical valve
Electric valve
Bleeder valve