Compression Ignition Addict
Join Date: Mar 2008
Location: Santa Rosa, CA
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Sounds like you have a vacuum leak going to your front hubs, do they lock in automatically or do you have to manually lock them to make them work?
The vent system will only operate the defrost if there is a loss of vacuum, and since you notice the change when you shift into 4wd it is probably one of the vacuum hoses going to the hubs, or it could be a bad hub seal.
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2005 F-250 CC/SB 4x4 medium wedgewood blue
5" lift, 5" Donahoe rear springs, 35x13.50 MTZ's, 18x12 Fuel Hostage wheels, 4.30 gears, Banks 4" exhaust, Airraid intake, SCT from Innovative, ARP headstuds, Bulletproof ficm, Bulletproof EGR cooler, Scangauge II, Randy Ellis Design lightbar, Street Scene flares, Harpoon mod, Zoodad mod, LED 2010 taillights, Switchback LED front turn signals