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If it is leaking under the truck it is not the heater core that is leaking. It would leak inside the vehicle on the passenger side. There is a drain tube for the A/C that is under the vehicle on the passenger side, and water from that with the A/C on is normal. If it is coolant, check the heater hose connections at the firewall. If you find that the heater core is actually leaking, replace it. No other repair is permanant.

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Q: I have a leak under my f-150 pick and it's not a real fast leak but my defroster isn't working properly and I wanted to know if there was anything you could put in to seal the leak from my heater core?
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