GMC 1998 Savana Van Owner's Manual page 108

Windshield Wipers
You control the windshield
wipers by turning the band
with the wiper symbol on it.
For a single wiping cycle, turn the band to MIST. Hold
it there until the wipers start, then let go. The w-ipers will
stop after one cycle. If you want more cycles, hold the
band on MIST longer.
You can set the wiper speed for
a
long or short delay
between wipes. This can be very useful in light rain or
snow. Turn the band to choose the delay time. The
closer to LOW, the shorter the delay.
For steady wiping at low speed, turn the band
to
the
LOW position. For high-speed wiping, turn the band
further, to HIGH. To stop the wipers, move the band
to OFF.
Remember that damaged wiper blades may prevent
you from seeing well enough to drive safely. To avoid
damage, be sure to clear ice and snow from the wiper
blades before using them. If they are frozen to the
windshield, carefully loosen or thaw them. If your
blades do become damaged, get new blades or
blade inserts.
Heavy snow or ice
can
overload your wipers. The
windshield wiper motor is protected from overload by a
circuit breaker and a fuse. If the motor overheats due to
heavy snow, etc., the wiper will stop until the motor cools.
Although the circuit is protected from electrical overload,
overload due to heavy snow, etc. may cause wiper linkage
damage. Always clear ice and heavy snow from the
windshield before using your windshield wipers.
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