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There is no fix other than a heater core replacement.

There are a couple of ways to do this, ranging from a full dashboard removal, to adventures in cutting the heating/cooling "plenum".

See "Related Questions" below for both and tons of real-world tips and tricks and sage advice.

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Q: How do you fix a heater core if leaking in 98 Mercury Sable?
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If it is leaking inside the car, the heater core has failed.If it is leaking inside the car, the heater core has failed.


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The heater hose connection is fully inside the engine compartment - so if you have leakage inside the car, chances are extremely high the core has sprung a leak. See "Related Questions" below for more


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