Every time it rains I end up with a small lake on my passanger side floor. Any idea what might be causing this? I read something about a a/c drain but I don't understand why it would only happen in the rain if that's the case.
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Sunroof or no?
Sounds like a clogged body drain on the passenger side.
That wouldn't explain the source of the water.
if it's only when it rains, then it would be a safe assumption that it's in the windshield or the hvac to firewall seals.
it could perhaps be the door seal.
do you have any white corners on the windshield? that is a sign of a bad glue job on the windshield. or have you had a windshield done lately?