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I also have a problem where I am only getting air through the vents, and none through my defroster, or floor. I have searched, and from the threads that I have read I think I may have enough info to do a thorough check for the problem
My main problem is that although my fan will be on "high", only one vent on the passenger side blows air hard. The other vents seem like they are on half power, as if there is a blockage of some sort. has anyone ever experienced this, and are there any suggestions?
Where the joints are in the duct work there are gaskets made of various materials. Sometimes they dry out and fall apart letting air to escape into the dash compartment. Take the dash panels apart and inspect the system. I hope this helps.