If its not raining then you will need the heater core inspected. Chances are your coolant is low so better check it.
Then the only area it can get in is the front windshield and any vents that are in an area that can allow water to gather. I have seen fords with bad areas that werent sealed inbetween the firewall and the upper welds,,, in where the wiper moter is.
You may have to have the winshield removed to inspect the seal inner areas for leakage, I poor window seal can cause this. You could try to isolate areas and run water from a hose for awhile look under the dash for signs.
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Pollen fillter is leaking happens a lot on focus you need a new one
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It only happens when it's raining &/or roads are wet.
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