Hello,
This can be caused by two things; first is a clogged evaporator drain tube which this video will help you find.
https://youtu.be/q9_MZiS2_NE
If have run the AC it sounds like the windshield seal has failed on the passengers side. Take a garden hose and spray it while looking with a flashlight under the dash to see if you tell where it is coming from. Please let us know what you find.
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Monday, December 31st, 2018 AT 11:31 AM