MANNOL Radiator Leak-Stop 9966

Product Features & Benefits

An advanced leak-stopping treatment that isolates micro-cracks and seals fluid pathways, curing strictly at the point of leakage without blocking radiator tubes.

• Effective leak elimination: Seals coolant leaks originating from gaskets, hose clamps, hairline radiator cracks, cylinder head gaskets, water pumps, and engine blocks.
• Targeted curing mechanism: Hardens exclusively at the leak site without clogging internal radiator channels; highly resistant to vibration and thermal expansion cycles.
• Universal compatibility: Safe to use with water, traditional antifreeze, and all coolant types; chemically neutral to structural metals, alloys, plastics, and rubber components.
• Seal rejuvenation: Restores flexibility and resilience to rubber seals and gaskets, preventing drying, cracking, and premature aging.
• Corrosion protection: Features powerful corrosion inhibitors that neutralize aggressive acids and extend the overall lifespan of the water pump.

Directions for Use

1. Start the engine and run it at idle until it reaches operating temperature, then turn on the cabin heater.
2. Shake the bottle thoroughly before use and pour the contents directly into the cooling system expansion tank (or radiator inlet).
3. One 325 ml bottle contains sufficient volume to treat cooling systems up to 12 liters in capacity.
4. Allow the engine to idle for approximately 10 minutes to circulate the sealant.
5. If leaks persist after 3 days of regular driving, mechanical repair of the affected component is required.