T700 sleeper fan

It should be in the Sleeper.

 

I'd follow the ductwork under the bunk back to a central unit - the one in my T2000 is under a plastic shroud with trays and stuff for storage, about 10 bolts to take off the cover, and there it is.

 

Look under the bunk.. the HVAC compartment should be on the right hand side of the vehicle, under the bunk. The fan will be the cylindrical looking section of that assembly, and there'll be wires going to it... if you got consistent power and ground to them, ground your fan and supply power to it from another source (I like to use a Power Probe for this sort of thing). That'll tell you the state of affairs of the HVAC blower.
Anyhow, lift the bunk, look on the right, and you'll see it... wish I could be more specific, but the T700 is the model of KW I'm probably the least familiar with.