2000 GMC Envoy Owner's Manual - Page 209

Payload The payload capacity is shown on the Certification/Tire label. This is the maximum load capacity that your vehicle can carry. Be sure to include the weight of the occupants as part of your load. If you added any accessories or equipment after your vehicle left the factory, remember to subtract the weight of these things from the payload. Your dealer can help you with this. The compressor should operate for brief periods of time. If the sound continues for an extended period of time, your vehicle needs service. To keep your battery from being drained, you may want to remove the LD LEV fuse in the engine compartment fuse block until you can get your vehicle serviced (see "Fuses and Circuit Breakers" in the Index). 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. Electronic 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. The ignition has to be on for the level control to work. The system includes a small electric air compressor and air-adjustable rear shock absorbers. You may hear the compressor operating when you load or unload your vehicle, and periodically as the system self-adjusts. This is normal. NOTICE: Your warranty does not cover parts or components that fail because of overloading. 4-45