DIRECTIONS 1. Flush Cooling System Clean 2. Fill with water or anti-freeze mix and run the engine until water is quite warm (for larger cracks, where water is streaming out, pack with fine steel wool as tight as possible) 3. Shake Block Sealer and pour into Radiator. Run engine for 15 minutes until the leak stops. For combustion chamber and head gasket leaks, do not relieve compression.
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