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Q: I have water leaking from under the drivers side dash whenever it rains.. on 2001 Lexus GS300

I am sure that there is a drain path that has become blocked as I have parked the car outdoors close to a tree over the last 8 years....I am trying to find where the drains empty so that I can attempt to unstop them. Where can I find documentation or schematics on drain paths / water removal paths?
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There are drains under the cowl, bulk head or firewall section on the car. Remove covers or screeens and clean out any debris. also look for seam sealer that has failed in those areas.
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