1994 Chevrolet Astro Owner's Manual - Page 244

What to Use Refer to the MaintenanceSchedule to determine what kind lubricant to of use. See "Recommended Fluids and Lubricants" in the Index. Engine Coolant The following explains your cooling system andhow to add coolant when it is low. If you have a problem with engine overheating, see "Engine Overheating" in the Index. The proper coolant for your vehicle will: 0 Give freezing protection down to-20°F (-29"C), or -34°F (-37°C) in Canada and for vehicles with the cold climate option. Give boiling protection up to 258°F (125 "C). Protect against rust and corrosion. Help keep the properengine temperature. Let the warning gages work as they should. 0 0 0 0 What to Use Use a mixture of one-half clean water (preferably distilled) and one-half antifreeze that meets "GM Specification 6038-M," which won't damage aluminum parts. You can also use a recycled coolant conforming to "GM Specification 603%"' with a complete coolant flush and refill. If you use this mixture, you don't need to add anything else. 6-26