Compression Ignition Addict
Join Date: Oct 2009
Location: Taneytown, Maryland
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That is a vacuum PUMP! If its constantly running then you have a vacuum leak. If you unplug it then you will only have defrost, since the mode doors are actuated by vacuum. Do you have ESOF 4x4? If so thats probably where your leak is. Your 4x4 will work without it if you manually engage the hubs (if you have auto hubs.)
It dosen't sound bad to me. The one an my 7.3 (and every other one I've heard) sounds the same way.
1999.5 F-350 7.3, six-speeed
If Canada was that great, it would be a state...
When seconds count, the police are just minutes away.
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