How to Change Coolant
Regularly changing your vehicle's coolant prevents corrosion and maintains proper engine temperature. At AutoNation, we stock a complete selection of quality radiators and cooling system components to keep your engine running at the right temperature. Fresh coolant helps prevent overheating, freezing, and expensive engine repairs. With the right tools and safety precautions, you can change your coolant at home.
Safety First
Never remove the radiator cap or work on the cooling system when the engine is hot. Coolant can reach temperatures over 200 degrees Fahrenheit under pressure. Wait at least two hours after driving for the system to cool completely. Place wheel chocks behind the rear tires, engage the parking brake, and work on level ground.
Gather Your Supplies
You'll need fresh coolant, distilled water, a drainage pan, funnel, pliers, and basic hand tools. Check your owner's manual for the correct coolant type and system capacity. Many modern vehicles require specific coolant formulations - using the wrong type can cause problems. Having a new thermostat on hand is also wise since these often need replacement when changing coolant.
Drain the Old Coolant
Locate the radiator drain plug or petcock valve at the bottom of your radiator. Position your drain pan underneath, then slowly open the valve. Remove the radiator cap to speed drainage. Some vehicles also have engine block drain plugs - consult your manual for locations. Never dump old coolant on the ground or in storm drains - it's toxic and must be properly recycled.
Flush the System
Once drained, close all drain plugs and fill the system with distilled water. Run the engine with the heater on high until it reaches normal operating temperature. This circulates the water and helps remove old coolant residue. Turn off the engine, let it cool completely, then drain again. Repeat if the drained water appears dirty.
Check Components
While the system is drained, inspect all hoses and clamps for cracks, softness, or damage. Check the radiator for leaks or corrosion. A cooling system pressure test can reveal hidden problems. Replace any questionable parts now to prevent future issues.
Add Fresh Coolant
Mix the new coolant with distilled water according to the manufacturer's specifications - usually 50/50 for most applications. Fill slowly to avoid air pockets. Replace the radiator cap and start the engine. Run it until the thermostat opens and check for leaks. Top off the coolant as needed once the system is fully warmed up.
Bleed the System
Air pockets in the cooling system can cause overheating. Many vehicles have specific bleeding procedures - consult your manual. Generally, you'll run the engine with the heater on high and radiator cap off until no more air bubbles appear. Some vehicles have dedicated bleeder screws to help remove trapped air.
Trust AutoNation's extensive inventory of cooling system components for your maintenance needs. Our dedicated parts team ensures you get the exact components needed to keep your engine running cool and protected.