Cooling System Flush

High Performance in All Coolants

Wynn's Cooling System Flush is a concentrated product designed to thoroughly clean all automotive cooling systems.

  • Powerful acid free radiator cleaner.
  • Dual action - 1: Removes scale. 2: Eliminates rust, deposits and oily residues.
  • Excellent performance in all types of cooling liquid, including OAT coolant.
  • Keeps dirt and particulates in suspension whilst cleaning.
  • Safe for rubber hoses, seals and all metals in the cooling system.
  • Extremely effective in all closed-circuit cooling systems.
  • Restores the optimal operation of the controls within the cooling system.


For all "water" cooled systems of petrol and diesel engines.
Recommended when changing the cooling liquid following the manufacturer’s instructions.
Particularly effective when cleaning older cooling systems.


Shake the can well and add contents to the cooling system via the expansion tank if part of the system circuit (2 hoses: out and return), or directly into the radiator if a single hose overflow tank is fitted.
For higher performance, first replace the old coolant by water, then add Wynn’s Cooling System Flush.
Warm up the engine with the heater control in HOT position.
Let the engine run at idle for 10 minutes. Heater still in "hot" position.
Stop the engine and allow to cool, open drain valve and empty the system.
With system still open, flush with water until clear, close system and refill with coolant.
Contents of one can of 325 ml treats systems with capacity up to 12 litres.
Add Wynn's Cooling System Stop Leak as a leak preventive agent.


PN 45941 – 24x325 ml – DE/IT/FR/NL/PT
PN 45944 – 24x325 ml – EN/ES/RU/SV



Cooling system problems, such as leaks and insufficient cooling due to fouling of the system, are the primary cause of vehicle breakdowns. To prevent these problems Wynn’s recommends radiator treatments.

Cooling System