I am new to the forums, great article on the vacuum hubs, very helpful. I do have a question though. I am trying to figure out how the vacuum system inherent in the KIA 4WD's work. Right from the switch in the cab, through to the hubs actually engaging. Does anyone have any idea of where to find a diagram etc? Canada Customs isn't agreeing with my contentions that the Vacuum Hub Locks, are part of a vacuum control assembly (that being the swtich, lines, seals, valves etc). Can anyone help with how the whole system works and the parts involved in the vacuum system?
Disgruntled with the Government.

Just behind the air filter assembly is the vacuum soleniod. When you shift to 4H or 4L an electrical signal is sent to the soleniod. It picks and manifold vacuum is applied to the hubs. The hubs then engage which applies power to the front wheels. If you want the diagram I have it. Send me an e-mail at mjats@juno.com

1998 Sportage - Gone.
2004 Honda Civic Coupe.
2007 Suzuki Grand Vitara - She got it.