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You must have a hole in the heater core. There is an old remedy my dad used and that was putting ground black pepper in the radiator. The pepper circulates and the water pushes it into the hole if its not too large.

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Q: If my coolant resovour is full I have water on the passenger side floor board if I run with resovour empty but make sure radiator is full I don't get any water and the heater still works great?
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