Compression Ignition Addict
Join Date: Mar 2008
Location: Santa Rosa, CA
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I currently have the same problem. The funny thing is that my 4-wheel drive light comes on, but my front end doesn't actually lock in. I asked abrannan about it and he mentioned its probably a certain electrical component he pointed out to me under the hood. I can't remember the name of it, just that its related to the 4-wheel drive vacuum system and will reroute your ac to the defrost vents. I'll give an update if I find anything else out.
The 4wheel drive light comes on when the transfercase switches into 4wd, that is electronic so it is separate from the vacuum hub system.
When you switch to 4wd, there is also an electronic solenoid close to the vacuum pump that sends a vacuum signal to the hubs to engage them. But if you have a vacuum leak somewhere, the hubs themselves will not be activated even though the transfercase is and the 4wd light is on.
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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
Last edited by GregsSD; 07-17-2010 at 10:13 AM.