However, a reasonable estimate for a 1989 Chevy G-20 van's curb weight (weight without passengers or cargo) would be between 3,500 and 4,500 pounds (1,588 and 2,041 kg). This is a broad range, and you'd need the specific details of the van to get a more precise figure. You might find this information on the vehicle's original sticker, owner's manual, or through a vehicle identification number (VIN) lookup.