1996 GMC Suburban Owner's Manual - Page 87

Leaving Your Vehicle With the Engine Running Move the lever up as far as it will go. 3. If you have four-wheel drive, be sure the transfer case is in a drive gear-- not in NEUTRAL (N). 4. Move the ignition key to LOCK. 5. Remove the key and take it with you. If you can leave your vehicle with the ignition key in your hand, your vehicle is in PARK (P). It canbe dangerous to leave your vehicle with the engine running.Your vehicle could move suddenly if the shift lever not fully in PARK (P) with the is parking brake firmlyset. If you have four-wheel drive with a manual transfercase shift lever and your transfer case is in NEUTRAL (N), your vehicle will be free 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 (N). And, if you leave the vehicle with the engine running, could it overheat andeven catch fire. You or otherscould be injured. Don't leave your vehicle with the engine running unless you have to. -- 2-23