Compression Ignition Addict
Join Date: Mar 2008
Location: Santa Rosa, CA
Thanked 13 Times in 13 Posts
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The climate control system will revert to defrost if there is a problem with the vacuum.
So you either have a vacuum leak, or your vacuum pump is bad.
The vacuum pump is under the hood on the passenger side fender, when you first start your truck you should hear the pump run for a short time, if it keeps on running then you have a vacuum leak.
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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