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If by "internal" you mean inside the cab, the heater core would most likely be the culprit and needs to be replaced. If you mean within the engine, then you have a bigger problem as it could be a blown head gasket, or a cracked cylinder head in which case the cylinder head will have to be removed for repairs.

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Q: How do you fix internal coolant leak on 1990 Mazda b2000 pickup?
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