Holts Radweld Radiator Leak Repair 250ml

Cooling System Leak Repair

Holts Radweld Plus Total Cooling System Leak Repair 250ml

A pour-and-go cooling system leak repair formula for radiators, hoses, heater cores, engine blocks, cylinder heads, head gaskets, freeze plugs and water pump gaskets.

Holts Radweld Plus is a total cooling-system leak repair formula designed to locate and seal leaks without the need to drain or flush the cooling system. It is suitable for repairs involving radiators, hoses, heater cores, engine blocks, cylinder heads, head gaskets, freeze plugs and water pump gaskets.

The anti-corrosion formula is designed to protect and maintain the coolant system while sealing leaks. It mixes with all coolant and antifreeze types. One full 250ml bottle treats cooling systems up to 21 litres; for cooling systems of 7 litres or less, use half a bottle.

Directions For Use: Use only when the engine is cool. Shake thoroughly and pour the correct dosage directly into the radiator or coolant reservoir. Top up with the correct coolant if needed, run the engine for approximately 10–15 minutes to circulate, then monitor for continued leakage. Check the product label and vehicle handbook before use.

Important: This is a cooling-system leak repair treatment, not a substitute for diagnosing serious mechanical faults. Do not remove a radiator or expansion-tank cap when hot. If overheating or coolant loss continues, have the vehicle inspected before driving.