Do not use in a dirty or partially clogged radiator. Use Prestone® Flush + Cleaner first.
1. With engine off and cool, shake well and add entire contents to radiator and fill with Prestone® 50/50 Antifreeze/Coolant. For systems larger than 12 quarts use two bottles. 2. Run engine at the highest heater setting for 10 minutes after reaching normal operating temperature. 3. Turn off, allow to cool. Fill with Prestone 50/50 Antifreeze/Coolant. Check fluid level frequently, top off as necessary.