Ford 1999 Windstar Owner's Manual page 61

Controls and features
If your vehicle has a separate clock module, (other than the digital radio
display), the CLK button will not
function in the above manner.
AUTO
CLK
The CLK button will allow you to switch between media display mode
(radio station, stereo information, etc.) and clock display mode (time).
When in clock mode, the media information will display for ten seconds,
when the radio is turned on, and then revert to clock information.
Anytime that the media is changed, (new radio station, etc.), the media
information will again display for ten seconds before reverting back to
the clock. In media mode, the media information will always be
displayed.
Mute mode
Press the control to mute the
playing media. Press the control
EJ
again to return to the playing media.
MUTE
Rear seat controls (if equipped)
The Rear Seat Controls (RSC) allow
VOLUME MEDIA SEEK
MEM
the rear seat passengers to operate
the radio, tape, CD, or CD changer
(if equipped).
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