Description
Radiator Stop Leak is a cooling-system sealing additive intended to close small leaks, porous solder joints, and hairline cracks without blocking normal coolant circulation.
What It Does
- Helps seal small cooling-system leaks and hairline cracks.
- Compatible with many conventional coolants and aluminum radiators.
- Can be used as a preventive sealing treatment where appropriate.
Best For
Minor cooling-system seepage where the radiator, heater core, hose, or engine is not suffering a major mechanical failure.
Use & Compatibility
Treat only compatible water-based cooling systems and follow LIQUI MOLY dosage instructions. Major leaks, overheating, or head-gasket failure require mechanical diagnosis and repair.