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Issue in summer sounds like clogged evaporator core drain. Do you use MAX Defrost to clear windows in colder weather or turn A/C on in cooler temps to remove humidity? In MAX Defrost, AC will operate if outside air is above about 35.6 F. Do you have a panoramic roof? It's simply held in place with a sealant. Perhaps sealant is damaged. My guess is, if panoramic roof leaked, water would be channeled to the pillars much like rear window washer hose leak.