GMC 1994 Yukon Owner's Manual page 101

Here's the second way to go to a higher speed:
0
Move the Cruise
switch from ON
to
WA.
Hold it
there until you
get up to the
speed you want,
and then release
the switch.
To increase your speed in very small amounts, move the switch to WA.
Each time you do this, your vehicle will go about 1 mph
(1.6 k d h ) faster.
To Reduce Speed While Using Cruise Control
There are two ways to reduce your speed while using cruise control:
Push in the
button at the end
of the lever until
you reach the
lower speed you
want, then release
it.
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To slow down in very small amounts, push the button for less than half
a second. Each time you do this, you'll go 1 mph (1.6 km/h) slower.
Passing Another Vehicle While Using Cruise Control
Use the accelerator pedal to increase your speed. When you take your foot
off the pedal, your vehicle will slow down to the Cruise Control speed you
set earlier.
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