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Radiator & Block Sealer | FAQ

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What does BlueDevil Radiator & Block Sealer Fix?

It permanently repairs leaks from a radiator and/or block.

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My car is overheating. Will BlueDevil correct this?

No, any cooling related problems must be repaired first. Defective fan switch, fan clutch, clogged or restricted cores, heavy scale and sediment deposits, or systems clogged from old antifreeze must all be properly functioning and capable of adequately cooling the vehicle.

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How does it work?

BlueDevil Radiator & Block Sealer reacts to temperature differential created by airflow at the leak point. That temperature differential is the catalyst for the chemicals in BlueDevil to react and form a chemical weld.

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Will BlueDevil work with antifreeze?

Yes, BlueDevil Radiator & Block Sealer is compatible with all types of antifreeze.

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Can I pour BlueDevil into my overflow/reservoir?

For best results, BlueDevil Radiator & Block Sealer should not be poured into a reservoir or overflow.  If you do not have direct access to the radiator you should, with the vehicle off and cold, disconnect the top radiator hose and pour the product directly in.  Reattach the hose, tighten the clamp and continue with the rest of the directions.

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Do I need to remove the thermostat?

No, BlueDevil Radiator & Block Sealer is an easy-to-use formula.

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How long will the repair last?

BlueDevil Radiator & Block Sealer creates a PERMANENT seal.

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Will BlueDevil prevent a radiator from leaking?

No, BlueDevil Radiator & Block Sealer should not be used as a preventative maintenance.

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Does BlueDevil work on plastic radiators?

Yes, it is suitable to repair all types of leaks in all types of radiators.

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Do I need to drain the system after the use of BlueDevil Radiator & Block Sealer?

No, the product may be left in the cooling system.

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Will you guarantee your product to work?

BlueDevil Radiator & Block Sealer is guaranteed to work when the diagnosis is correct and it is used in accordance with the directions.

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I tried the product and my radiator has a white crystalline deposit or jell, what is this?

These are tell-tale signs of a radiator that is in need of service. When fluids are not changed often enough under severe operating conditions or in areas with hard water, scale deposits may form in the passages. Sometimes old fluids will jell or crystallize and can be seen in the system. To remove these deposits flush cooling system using a flushing agent and/or a flushing machine.

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