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Could be that your heater core is leaking. Also common through firewall....especially where the hinges for the hood mount. I had the same problem with a 450 SLC and after many tries inside the car and many wrong fixings I discover one day that the car din't leave any water in the floor,so I thought it was plug ,but not ,it was a crack on the plastic box that cover the evaporator core ,I sealed it and problem gone.

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โˆ™ 2008-12-13 18:28:44
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Q: What would cause a Water leak under dash on 1984 380sl Not the windshield or ac?
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