RE: AC blowing out defrost vents..
Check for a loose vacuum line/cluster plugunder the dash on the passenger side. Sometimes a passenger foot gets under there and catched the vacuum cluster. Also check the black vacuum line that goes to the vacuum canister between the inner and outer fenders. The line will sometimes get chaffed thru by vibration where ot passes thru the inner fender.
2004 Freestar Limited 4.2 V6 w/Water Injection & Iridium plugs
2010 Lincoln MKZ AWD (Vacationing in Arizona)
2007 Focus SE (Just bought 9/29/2012 @ 59K miles)
1979 Gilson 32" 10HP Snowblower
2007 Generac 17.5Kw Generator w/33HP Twin-Cylinder engine
Farmhand 3-Cylinder air compressor
AMSOIL Lubricants and Filters in everything
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