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Mine also blew air from defrost vents when I switched to 4x4 and it turned out to be the vacuum solenoid that is mounted to the passenger side firewall just behind battery. Very easy to replace and about 60 bucks from the dealer.
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2003 Excursion, 6.0, 4X, everything stock.
2 Trucks, 1 Motorcycle, 3 Dogs, 1 Cat, 1 Bearded Dragon, and 1 Wife
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