2003 Buick Rendezvous Owner's Manual - Page 303

Automatic Level Control 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. T-ing a Trailer 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 this section. Ask your followed all the steps in 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