esof ?
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New User
Joined: Jan 2010
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2001 250 SD. 4 wheel drive does nothing.No power at dash switch,no power at transfer case,power on trasfercase relay by brake booster power on middle wire of vac pump,there is also vaccum problem with heat and ac which I can not find any leaks,oh and also hooked up new vac pump any ideas
Senior User
Joined: Jul 2004
Posts: 322
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All of my esof problems have been vacuum leaks with the hub or pump on the passenger's side of the engine compartment. Usually when this happens your heater and ac will default to the defrost position no matter what the select lever says (when you attempt to engage 4 wheel drive. I finally got tired irritated and installed Warn Premiums hubs. Also about 2 or three threads down is another esof problem with many more detailed posts including wiring diagrams and voltage tests hope this helps.
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