Does your leaky vehicle have a sunroof? If so, try this first.

Unclogging sunroof drains. If your car has a water leak that is causing a wet headliner, water dripping from the headliner, wet roof pillar, a damp carpet or water pooling in the foot wells you should check your sunroof drains. Blowing compressed air down the drain lines can help clear blockages. I would suggest keeping the compressed air around 30 PSI. Higher PSI can potentially dislocate the drain tube inside the vehicles column.
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