Buick 1993 Roadmaster Owner's Manual page 136

Rear Window Defogger (Option)
The lines you see on the
rear window warm the glass
to remove fog and ice. Turn'
the control on' to start
warming your window.
After a few minutes; it will
turn off automatically.
Audio Sysxems
Your Delco@ audio system has been designed to uperate
easily and give years -of listening pleasure. But you will
get the most enjoyment out of your system if you
acquaint .yourself with it first. Find out what your
Delcos system can do and how to operate all its
controls, to be sure you're getting the most out s f the
advanced engineering that went into it.
FM Stereo
FM stereo will give you the best sound. But FM signals
will reach only about
10 to 40 miles (16 to 65
km). And,
tall buildings or hills can interfere with FM signals,
causing the sound to come and go.
AM
The range for most AM stations is greater than for FM,
especially at night. The longer range, however, can
cause stations to interfere with each other. AM can pick
up noise from things like storms and power lines. Try
reducing the treble to reduce this noise.