1999 Pontiac Montana Owner's Manual - Page 263

yellowblue Electronic Level Control (Option) CAUTION: Things you put inside your vehicle can strike and injure people in a sudden stop or turn, or in a crash. D Put things in the cargo area of your vehicle. Try to spread the weight evenly. D Never stack heavier things, like suitcases, inside the vehicle so that some of them are above the tops of the seats. D Don't leave an unsecured child restraint in your vehicle. D When you carry something inside the vehicle, secure it whenever you can. D Don't leave a seat folded down unless you need to. On vehicles equipped with the optional 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. If the engine is running or the ignition key is in ACCESSORY, you may hear the compressor operating when you load or unload your vehicle, and periodically as the system self-adjusts. This is normal. The compressor should operate for brief periods of time. If the sound continues for an extended period of time, 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. 4-31