ROWE HIGHTEC RADIATOR STOP LEAK is a fast-acting additive that seals small leaks in the cooling system from within. Its specially developed sealing particles flow through the circuit and lodge in hairline cracks and pinholes to stop coolant loss. It offers a quick, reliable repair to keep a vehicle mobile until a permanent fix can be made.

Purpose and specifications

This additive is suitable for all water-cooled, closed cooling systems on cars, vans and light commercial vehicles. It quickly and reliably seals hairline cracks and small leaks in the radiator, hoses and core without dismantling components. It is a service additive without OEM viscosity approvals and is fully compatible with conventional coolant fluids already in the system.

• 0.250L container, with approximately 250 ml dosed into a typical car cooling system
• Seals hairline cracks and small leaks within minutes of circulation
• Stays in suspension to protect against further minor coolant loss
• Compatible with existing coolant, so no full drain is required for emergency use

When to use / change?

Reach for it as soon as you notice slow coolant loss or a minor weep from the radiator or hoses. Add it to the warm cooling system and let the engine run for about 10 minutes, then check the coolant level. It works across normal engine operating temperatures; open the radiator cap slowly to avoid scalding. Unopened, the product keeps for approximately 5 years when stored cool and dry.

Frequently asked questions

How much should I add?
Dose approximately 250 ml into the warm cooling system, run the engine for about 10 minutes, then check the coolant level.

Will it block my heater or thermostat?
When used at the correct dose in a properly filled system it seals leaks without clogging healthy passages, but it is intended as a temporary repair aid.

Is it a permanent fix?
It reliably stops small leaks, but a damaged radiator or hose should still be inspected and repaired when convenient.

Suitable for: All water-cooled petrol and diesel vehicles. Always verify the exact approval against your vehicle's owner manual before use.