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It will either be a clogged condensation drain if you still have AC or your heater core most likely.
Check your coolant- If you're losing it, then there ua go.
Stick your hand up behind your glove box... Feel around & see if you can isolate the leak.
Take the car thru a carwash and shine a light down in the passenger footwell while it's in there... If it leaks, figure out from where.
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