TRUCK SERVICE MANUAL
Some installations require the use of a check valve
to prevent alcohol entering the engine induction system.
cycle, a partial vacuum is present at the compressor
intake. A line from the evaporator is connected to the
compressor intake, therefore a vacuum is created above
the alcohol in the alcohol reservoir. Air at atmospheric
pressure or greater, depending upon the type of
installation, enters the evaporator and passes through
the tube which is immersed in the alcohol. This air
passing through the alcohol causes the alcohol to bubble
and the vapor formed by the bubbling is induced into the
Fig. 1. AE-1 Alcohol Evaporator
The alcohol evaporator is designed to permit
vaporized alcohol to be drawn into the air brake system
to overcome possible freezing of any moisture in the air
NOTE: The installation of an alcohol evaporator does
not mean that daily draining of all air reservoirs is not
required. In a moisture-laden atmospheric air system, a
properly installed and maintained alcohol evaporator and
daily draining of all reservoirs will be very effective in
preventing air system freeze-ups.
The AE-1 alcohol evaporator (Fig. 1) has a die cast body
which houses the filter, filter cap and evaporator tube.
The die cast body also serves as a mounting bracket.
The container can either be glass, plastic or metal and
may also either be a pint, quart or two-quart size.