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In addition to Sin's idea, you may want to suggest to your sister inlaw to run the heat with AC on. This will dry up the air in the vents and cause much less condensation. Also, make sure she is not using "recirculation" mode constantly. First of all it's not that good to breath recirculated air for long periods of time, second, recirculated air collect a lot of moisture from breathing and there is no place for moisture to go, since no fresh air is entering the car and no moist air exits the car in the recirculation mode (well, some air does circulate of course, but for illustration purposes I try to stay in the absolutes). So, make sure the system is in "fresh air" mode and if it wasn't, that should cure the problem all by itself. I see so many paople driving around in rainy weather with all the windows completely fogged up trying to wipe the moisture from the glass, and I bet 9 out of 10 of those people have their systems in recirculation mode. I often turn on the AC during the winter to clear up condensation. It is good for the AC (keeps things lubrivcated during the low-use time) and good for my visibility.
Good luck.
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Vladimir. 1998 S70. Base, 5-speed manual.
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