GMC C series 2002 Owner's Manual page 85

Increasing Speed While Using Cruise Control
There are two ways to go to a higher speed:
D
Use the accelerator pedal to get to the higher speed.
Press the button at the end of the lever, then release
the button and the accelerator pedal. You'll now
cruise at the higher speed.
D
Move the cruise switch from ON to R/A. 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 R/A briefly.
Each time you do this, your vehicle will go
about 1 mph (1.6 km/h) faster.
If the switch is held at R/A for longer than
20 seconds, the cruise control will automatically
turn off. The cruise control function will be made
available again the next time the engine is started.
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Reducing Speed While Using Cruise Control
Press in the button at the end of the lever until you
reach the lower speed you want, then release it.
To slow down in very small amounts, tap the
button briefly. Each time you do this, you'll go
1 mph (1.6 km/h) slower.
If the button is held for longer than 15 seconds, the
cruise control will automatically turn off. To make
cruise control available again, the cruise switch must
be moved to OFF then back to ON.
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.