Chevrolet 1999 Lumina Owner's Manual page 95

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Move the cruise switch from ON to R/A. Hold it
there until you get up to the speed you want, then
release the switch. (To increase your speed in very
small amounts, move the switch to R/A. Each time
you do this, your vehicle will go about 1 mph
(1.6 km/h) faster.)
The accelerate feature will only work after you set the
cruise control speed by pushing the SET button.
Reducing Speed While Using Cruise Control
There are two ways to reduce your speed while using
cruise control:
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Push in the SET button until you reach the lower
speed you want, then release it.
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To slow down in very small amounts, push the SET
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.
Using Cruise Control on Hills
How well your cruise control will work on hills depends
upon your speed, load and the steepness of the hills.
When going up steep hills, you may have to step on the
accelerator pedal to maintain your speed. When going
downhill, you may have to brake or shift to a lower gear
to keep your speed down. Of course, applying the brake
takes you out of cruise control. Many drivers find this to
be too much trouble and don't use cruise control on
steep hills.
Ending Cruise Control
There are two ways to turn off the cruise control:
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Step lightly on the brake pedal OR,
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Move the cruise switch to OFF.
Erasing Speed Memory
When you turn off the cruise control or the ignition, or
shift into PARK (P) or NEUTRAL (N), your cruise
control set speed memory is erased.
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