2003 Hummer H2 Owner's Manual - Page 120
2003 Hummer H2 Manual
Page 120 highlights
CAUTION: All-wheel drive vehicles with the transfer case in NEUTRAL will allow the vehicle to roll, even if your shift lever is in PARK (P). So, be sure the transfer case is in a drive gear -- not in NEUTRAL. Always set your parking brake. Follow the proper steps to be sure your vehicle won't move. See "Shifting Into PARK (P)" in the Index. If you're pulling a trailer, see "Towing a Trailer" in the Index. Electronically Controlled Air Suspension System (If Equipped) The electronically controlled air suspension keeps the rear of your vehicle level as you load and unload it. The system includes a compressor, two height sensors and two air springs supporting the rear axle. The engine must be running for the system to operate and level the vehicle after loading or unloading. The system will suspend leveling if any of the doors or the liftgate are open. Once the doors are closed, system leveling will continue. The system can lower the vehicle to the standard ride height with the engine running and for up to 30 minutes after the ignition has been turned off. You may hear the compressor running when you load your vehicle, and periodically as the system adjusts the vehicle to the standard ride height. Load leveling will not function normally with the inflator hose attached to the inflator outlet. Remove the inflator hose from the outlet when it is not in use. See "Accessory Inflator" in the Index. 2-38
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