GM Service Manual Online
For 1990-2009 cars only

Jack Position

Caution: Raising your vehicle with the jack improperly positioned can damage the CNG fuel system and cause a natural gas leak. If the gas is accidentally ignited, you or others could be seriously injured. Never use the CNG fuel system components or fuel lines as lift points.

See "Changing a Flat Tire" in the Index of your owner's manual for the correct front and rear jack positions.