Water from the cowl runs down over the kick panel vents and out the bottom of the fender. If the fender gets full of leaves and junk it can plug up, that's why they rust out in that area. The vent should be sealed against the inside metal panel. If it's not sealed when the water runs over the vent it'll leak in on the floors.
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Hank
70 Chevelle SS396(454), M20, 3.73
My Chevelle
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