1998 GMC Savana Van Owner's Manual - Page 298

Underbody Maintenance Chemicals used for ice and snow removal and dust control can collect on the underbody. If these not are removed, accelerated corrosion (rust) can occur on the underbody parts suchas fuel lines, frame, floor pan and exhaust system even though they have corrosion protection. At least every spring, flush these materials from the underbody with plain water. Clean any areas where mud and other debris can collect. Dirt packed in closed areas of the frame should be loosened before being flushed. Your dealer or an underbody car washing system do can this for you. Chemical Paint Spotting Some weather and atmospheric conditions can create a chemical fallout. Airborne pollutants fall upon can and attack painted surfaces your vehicle. This on damage can take two forms: blotchy, ringlet-shaped discolorations, and smallirregular dark spots etched into the paint surface. Although no defectin the paint job causes this, GM will repair, at no charge the owner, the surfaces of to new vehicles damagedby this fallout condition within 12 months or 12,000 miles (20 000 km) purchase, of whichever occurs first. This applies only to materials manufactured and sold by General Motors. Bodies, body conversions equipment or not made or sold by General Motorsare not covered. 6-58