Huh !! Did you say that the air was blowing OUT of the vent under the wiper ? I have never checked this but I would think that the air would be sucked in rather than blown out. Did you rewire the motor recently, could the blower motor be running backwards ? If this were the case, a use a small piece of newspaper paper on any of your vents, the paper would get sucked in rather than blown away. Someone can correct me, but you should hardly get any outward flowing air thru the vents if the blower was running backwards.

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Saumil S. Patel