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How to change your coolant Step 1. A quick coolant checkup using an antifreeze tester on a regular basis can tell you if your engine coolant is depleted of additives. How To Change The Coolant Without Causing The Engine To Overheat Axleaddict Youll need to invest in an air-powered refilling tool to remove air pockets from the cooling system as you fill. How to replace coolant . In this case a 5050 mix of coolant antifreeze and distilled water should be added to the radiator or the cooling system reservoir as well as a visual inspection of hoses belts and the radiator in order to find if there are any leaks that can be causing the low coolant level. Top off the coolant in the radiator to the correct level--usually about an inch below the bottom of the radiator neck. Remove the lower hose Slip the pointed end of the removal tool all the way into the end of the hose. Since the old reservoir is gone this is a good opportunity to clean any coolant debris dirt or gunk that may b