You need to service the cooling system on your Chevrolet Silverado truck every 30,000 miles or 30 months. This includes draining the engine coolant and adding fresh coolant if the old stuff is contaminated. A 50-50 mix of water and antifreeze is needed. On the 2002 Silverado, you must use green ethylene glycol antifreeze, and “Dex-Cool” coolant with de-mineralized water is recommended.
Tools Used: Tools, Wheel chocks, Large container, Pliers, Water, Coolant/antifreeze
Apply the truck’s parking brake and block the wheels with blocks or wheel chocks to make sure the vehicle doesn’t roll while you are under it. Place a large container under the radiator drain, located at the lower left side of the radiator. Pull the radiator drain hose out of its support bracket and insert it into the container.
Loosen the drain fitting at the bottom of the radiator–this may require a pair of pliers–and let the coolant drain into the container. Remove the surge-tank cap in the engine compartment so the coolant drains faster.