Coolant, or anti-freeze, is a liquid chemical agent which prevents engines from freezing or overheating. The main chemical in coolant is ethylene glycol, which is hazardous to both humans and animals. Coolant used in engines is also likely to contain dangerous levels of heavy metals that are an environmental hazard when poured into sewers, soil or drains. When changing coolant it is best to recycle the used fluid so that it doesn't contaminate the environment or endanger anybody in the household.
Drain engine coolant into a collection pan when changing the vehicle's fluid. Make sure to collect it in a pan that doesn't have any other chemicals stored in it.
Place a funnel into a plastic container that can be sealed, such as a milk jug. Pour the coolant into the plastic container. Seal the container.
Take the used coolant to an auto repair shop or a certified local government hazardous-waste recycling plant. Auto shops have services that collect their waste products and often collect outside fluids as well. Check with the shop to make sure they're collecting before taking your coolant. Check with your city or county website to see where the hazardous-waste facility is in your locality.
