2008 Hummer H3 Alpha Owner's Manual - Page 227

If the water is not too deep, drive slowly through it. At faster speeds, water splashes on your ignition system and your vehicle can stall. Stalling can also occur if you get your tailpipe under water. And, as long as your tailpipe is under water, you will never be able to start your engine. When you go through water, remember that when your brakes get wet, it may take you longer to stop. See Driving in Rain and on Wet Roads on page 4-33 for more information on driving through water. structure, steering, suspension, underbody shields, wheels, tires, and exhaust system for damage. Also, check the fuel lines and cooling system for any leakage. Your vehicle will require more frequent service due to off-road use. See the Maintenance Schedule for additional information. Assist Steps If your vehicle has removable side steps, remove the steps prior to off-roading to give your vehicle more ground clearance and to prevent damage to the vehicle from the side steps dragging and/or catching on obstacles. Notice: Do not drive off-road with the side steps attached to your vehicle. You can damage the side steps and/or your vehicle's frame if they get caught or drag against an obstacle. This damage would not be covered by your vehicle's warranty. Always remove the side steps prior to any off-road driving. After Off-Road Driving Remove any brush or debris that has collected on the underbody, chassis, or under the hood. These accumulations can be a fire hazard. After operation in mud or sand, have the brake linings cleaned and checked. These substances can cause glazing and uneven braking. Check the engine and oil coolers and underbody skid shields for mud accumulation. Thoroughly and carefully clean these devices to allow proper cooling. Check the body 4-31