My Lemans had a water leak around the heat/AC blower fan. It took me while to find it but after sealing it up with black silicone the leak stopped. One thing I found that you may want to look at: The cowl has a flapper valve at the bottom to let water escape. The valve has a tendency to get clogged up with leaves/ debri. Remove the cowl grill reach down to the bottom front end of the cowl to find the valve.
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