Commercial Vehicle Cooling System Treatment & Stop Leak

Commercial Vehicle Cooling System Treatment & Stop Leak

W45690 · 1000ml

Cooling System Treatment & Stop Leak is a developed to stop small leaks in the radiator and cooling system and head gasket whilst adding further anti-corrosive properties to the coolant.

  • Stops and prevents leakages in the cooling system
  • Stops head gasket leaks and water pump gasket leakage
  • Is formulated not to block cooling system radiator channels and temperature sensors
  • Enhanced protection against rust and corrosion.
  • Will not harm rubber hoses, gaskets, or other system components
Parts Effectiveness
Cooling System


Engine Petrol & Hybrid petrol, Diesel & Hybrid diesel

For all “water” cooled systems of all engines. Is compatible with all antifreezes and coolants, including OAT coolants.

How to use

  1. If the cooling system is excessively fouled, it is recommended to first clean the system with Wynn’s Cooling System Flush (W45990)
  2. Add 1 litre to a minimum of 10 litres of coolant. 1 litre treats cooling systems up to 25 litres.
  3. Start the engine & bring up to operating temperature with all heater controls in the HOT position
  4. Let the engine run for approximately 5 to 10 minutes until the leak(s) are sealed
  5. If necessary, top up with cooling liquid

Can also be used as preventive agent. Shake tin well and add to cooling system. ASTM D1881 Test : Standard Test Method for Foaming Tendencies of Engine Coolant

Additional Information

Product Code
Units per case
Packaging Languages
1000 ml