2003 Chevrolet Astro Owner's Manual - Page 308

Vehicle Identification Vehicle Identification Number (VIN) Service Parts Identification Label You'll find this label on the front passenger door frame. It's very helpful if you ever need to order parts.On this label is: yourVIN, the model designation, paint information and a list of all production options and special equipment. Be sure that this label is not removed from the vehicle. This is the legal identifier for your vehicle. It appears on a plate in the front corner of the instrument panel, on the driver's side. You can see it if you look through the windshield from outside your vehicle. The VIN also appears on the Vehicle Certification and Service Parts labels and the certificates of title and registration. Engine Identification The 8th character in your VIN is the engine code. This code will help you identify your engine, specifications and replacement parts. 5-91