* Driver's side doorjamb: Look on the sticker affixed to the driver's side doorjamb. This sticker contains a wealth of vehicle information, including the paint code (often abbreviated as "WAX" followed by a letter/number code).
* Spare tire compartment: Some models have this information stamped on a metal plate located inside the spare tire compartment.
If you can't find it in either of these locations, your best bet is to contact a local Chevy dealership with your VIN number. They can access the vehicle's specifications and provide the paint code.