Opel GT Owner's Manual page 72

72 In struments, controls
With lever in position P, w ip ing frequency
is also dependent upon vehic le speed. As
vehic le speed increases, wiping will
become more frequent.
The w ip ing frequency selected via the
adjustm ent band remains stored until it is
changed again.
Further information - see pages 163, 157.
Windscreen washer system
To opera te, press b utton n on end of lev er.
Washer fluid is sprayed onto the
wind screen and at the same time the
wipers are operated for four cycles.
Further inform ation - see pages 163, 158.