Let engine cool,drain radiator (note:draining radiator may not completely drain cooling system. Engine block and heater core contain approximately 50% of cooling system capacity. Be sure to compensate for this when adding coolant)
Check owner's manual for cooling system capacity and manufacturer's recommended antifreeze/water ratio. A minimum of 50%, maximum of 70% antifreeze is recommended to achieve optimum freeze/boil and corrosion protection.
Run engine 10 minutes with heater on high. When engine has cooled, check freeze protection with an antifreeze tester . Add more antifreeze or water to radiator as necessary.
Fill reservoir with 50/50 antifreeze/water mix. Periodically check radiator and reservoir levels. Top off with a 50/50 mixture of antifreeze/water as needed.
Modern engine cooling systems are designed to operate year round with 50-50% concentration of high quality ethylene glycol base antifreeze/coolant and water. Meets automotive industry requirements for antifreeze and anti-boil protection. Provides excellent corrosion protection to all cooling system metals. This formula must not be mixed with regular(green)antifreeze . Doing so will reduce the extended life characteristics of this product to normal antifreeze levels.
Freeze/boil
Protection chart
Fahrenheit scale. Using a 15 psi pressure cap.
Percentage of cooling system capacity.