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YES - BY back flushing the heater core-same as back flushing the engine block-just use a garden hose.

Usually 'Stop Leak' will not clog the core. Try flushing the cooling system out first.

Note: The hot water goes in and the cooler water comes out. Flush the core going the other way so to clear any obstructions. If there is a clog, it might be something larger like bits of hose or corrosion. If the core is totally clogged, take it out and replace it with a new one. The amount of time you will spend doing this does not warrant using an old or used core.

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โˆ™ 2015-07-15 21:39:28
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Q: Can a heater coil clogged by Stop Leak be cleaned?
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Related Questions

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If it is water you have a plugged condensation drain line that needs to be cleaned out. If it is engine coolant you have a leaky heater core that needs to be replaced.

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