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Radiator Repair Information > Solder Bloom

Solder corrosiion may force you into radiator leak repair on your automotive part.

Potential causes for radiator solder bloom include poorly inhibited radiator antifreeze, which leads to solder corrosion and eventually an ineffective automotive part. Common leaks are simple to diagnose because they are often easily seen. All leaks will drip, weep or spray coolant. The coolant loss generally leads to engine overheating, which can cause more serious damage if the leak isn't found and fixed. Leak inhibiting additives can usually seal small leaks but radiator leak repair is a temporary fix. Some radiator experts recommend using sealers for pre-emptive maintenance. Various sealers have the tendency to increase risk of deposits forming in the cooling system, which could cause radiator, especially when used in excess.

Internal corrosion-caused leaks can be found anywhere on a radiator. The most at risk points are usually the seams and where the tubes are joined to the headers. The causes are generally cooling system neglect or bad ground connections between the engine, charging system and body itself.

The most common type of internal corrosion is solder bloom that can form when neglected coolant, rust and leak inhibitor additives react with the soldered joints in a copper and/or brass radiator. Whitish deposits begin to form and eventually block tubes that restrict the flow of coolant. In this case, you have the option of recoring or replacing your radiator but the cooling system should be flushed to remove sediment first.

Visit us online at for soldering radiator information, articles and new parts. Remember, the most effective fix for cooling issues is a new Modine radiator.

Solder Bloom
Solder corrosion caused by poorly inhibited antifreeze. Tube-to header joints are weakened and corrosion can restrict coolant flow.

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