No ideas to help you, but my dealer is telling me it's normal that my vents blow strongly through the defrost vents when I set it to feet! Face vents are fine, defrost is fine, it just doesn't like the feet setting.. The service advisor said the tech said it's normal due to sensors detecting humidity.. I'll be taking it to another dealer for a second opinion when it's time for my next oil change in a month.
I don't know your exact situation, but, there is an automatic defrost setting. I've had two cars and in over 4 years never had to manually put the defroster on. The sensor took care of it. Keep in mind though, it does not always blow through that vent with force. In winter, the climate control calling for heat always uses the feet vent, adds defrost as needed.
I used to keep the setting on auto & let the car have control, but over the past month or two I noticed condensation on the outside of the windshield. It was to the point that I was turning on the wipers to clear it off frequently. At some point I realized it's because more air is directed there when the vent setting is to feet or a combination of feet/face. As a result, I've manually chosen face vents to avoid the condensation. There's occasionally slight condensation when on face setting but it's not nearly as annoying.
That does not sound normal. On a less than 80 degree day and very humid I may get a tiny bit of moisture right above the vent, maybe an inch. It clears up with some driving. Sounds like yours is much more and perhaps the damper is not closing or not sealing properly. I never had so much to put the wipers on.
Hopefully, it doesn't come to that. But it seems to be fine now.... Strange that it was just the one vent though.
I've contemplated disconnecting my battery for a while to attempt to reset everything to defaults. Won't help if it's a mechanical fault though.
I know this is over a year ago but I’m experiencing this now or just noticed it now today. Was there an issue or is it normal?
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