Wynns Cooling System Stop Leak – 325ml (45644A)

Description

Genuine Wynns · Part no. 45644A

Wynns Cooling System Stop Leak 45644A is a 325ml treatment that seals small leaks in the radiator and cooling system and at the head gasket, while adding rust and corrosion protection. It is made to pass through radiator waterways and past temperature sensors without blocking them, and suits every antifreeze, OAT included.

Good to know

• Will it mix with my coolant? Yes, it mixes safely with every antifreeze and coolant, including the long-life OAT types used in most newer cars.
• Should I flush first? On a dirty system, flush, rinse and refill before adding a stop leak, so the sealer isn't washed straight back out.
• How do I add it safely? Wait until the engine is cold, since the cooling system is under pressure when hot, then pour it in and run the engine as the bottle directs.

Which one?

For a commercial vehicle with a bigger system, Wynns CV Treatment And Stop Leak 1L (W45690) does the same job in a larger bottle. A cracked head or block is a job for Holts Wondarweld (HREP0062A).

Key features

• Stops small radiator and system leaks
• Stops head gasket leaks
• Adds rust and corrosion protection
• Won't clog radiator waterways or sensors
• Compatible with OAT coolants
• 325ml bottle

Specification