Compression Ignition Addict
Join Date: Mar 2008
Location: Santa Rosa, CA
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Yes it sounds like the vacuum pump. When you first turn your key on (without starting the engine) you should hear it for a few seconds as it builds up the vacuum.
And both 2wd and 4wd Powerstrokes have a vacuum pump because it also controls the vent/defrost door settings. If your vacuum pump goes bad or you get a vacuum leak then your heater/AC will only blow out the defrost vent.
2005 F-250 CC/SB 4x4 medium wedgewood blue
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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, 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; 08-12-2008 at 08:37 PM.