Compression Ignition Addict
Join Date: Jan 2010
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That is the vacuum pump. It is on the passenger side, right in front of the hood hinges. Mine makes a lot of noise while it is on as well. It should eventually turn off. If it doesn't, it generally means that you have a vacuum leak.
Does your heater work correctly, or does it only have defrost?
2001 F350 Crew Cab Long Bed 4x4 6 speed
PHP Hydra, 4 inch MBRP Exhaust, GTP38R, FRx, DIY Exhaust Brake, T500 HPOP, Hutch/Harpoon,
6-liter Intercooler, 6637, DIY Coolant Filter, CCV Mod