Prestone Cooling System Flush (1 Litre) is a high-performance chemical cleaner formulated to deep-clean vehicle radiators, heater cores, water pumps, and engine water jackets. Designed for both routine maintenance and severe cooling system overhauls, this concentrated solution rapidly breaks down rust, mineral scale, corrosion, sludge, and oily residue that compromise heat dissipation and lead to engine overheating. Compatible with all water-cooled petrol and diesel engines, it prepares the cooling system for fresh antifreeze, ensuring maximum corrosion protection and extended component longevity.
Key Features & Benefits
- Eliminates Harmful Contaminants: Actively cuts through oxidized rust, lime scale deposits, grime, and oil contamination without damaging internal components.
- Universal Component Compatibility: Non-acidic, non-corrosive formulation safe on aluminum, cast iron, copper, brass, steel, rubber hoses, synthetic gaskets, and plastics.
- Restores Cooling Efficiency: Clears restricted fluid channels to optimize coolant circulation, lower operating temperatures, and prevent costly breakdown repairs.
- Pre-Fill Treatment: Neutralizes old degraded coolant remnants to maximize the chemical lifespan and rust inhibitors of newly introduced antifreeze.
- DIY & Workshop Ready: Easy-to-pour 1-litre bottle treats standard passenger car and light commercial vehicle cooling systems up to 10–12 litres in capacity.
Application Instructions
- Allow Engine to Cool: Never open a hot cooling system. Ensure the engine is completely cold before starting.
- Drain the System: Open the radiator drain petcock or disconnect the lower radiator hose to drain the existing depleted coolant into a suitable waste container. Close the valve once drained.
- Add Prestone Flush: Pour the entire 1-litre bottle of Prestone Cooling System Flush into the radiator or expansion tank.
- Top Up with Water: Fill the remainder of the cooling system with clean water up to the recommended fill mark and securely replace the pressure cap.
- Circulate the Cleaner: Turn vehicle interior heaters to maximum heat and run the engine at normal operating temperature for 45 to 60 minutes to circulate the cleaning agents through the entire system.
- Flush and Refill: Turn off the engine, allow it to cool, drain the cleaning fluid, and flush thoroughly with clean water until the discharge runs clear. Refill the system with the manufacturer-recommended specification of fresh Prestone Antifreeze/Coolant.
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