Buick 2003 Rendezvous Owner's Manual page 303

Automatic Level Control T-ing a Trailer
On vehicles equipped with the automatic level control,
the rear of the vehicle is automatically kept level as you
load or unload your vehicle. However, you should still
not exceed the GVWR or the GAWR.
If the key is in ACCESSORY, ON or when Retained
Accessory Power (RAP) is active, you may hear
the compressor operating when you load your vehicle or
shortly after you start your vehicle, and periodically as
the system self-adjusts. This is normal. See "Retained
Accessory Power (RAP)'' under Ignition Positions
on page 2-20.
The compressor should operate for brief periods of time.
If the sound continues for an extended period of time
(longer than one minute) or occurs many times
within one trip, your vehicle needs service.
Using heavier suspension components to get added
durability might not change your weight ratings. Ask your
dealer to help you load your vehicle the right way.
If you don't use the correct equipment an-.
drive properly, you can lose control when you
pull a trailer. For example, if the trailer is too
heavy, the brakes may not work well
--
or even
at all. You and your passengers could be
seriously injured. Pull a trailer only if you have
followed all the steps in this section. Ask your
dealer for advice and information about towing
a trailer with your vehicle.
Notice: Pulling a trailer improperly can damage
your vehicle and result in costly repairs not covered
by your warranty. To pull a trailer correctly, follow
the advice in this part, and see your dealer for
important information about towing a trailer with
your vehicle. Additional rear axle maintenance
is required for a vehicle used to tow a trailer. See
"Scheduled Maintenance Services" in the Index.
4-36