Military Vehicle Repair: m1010, radio hole, rocker switches

Question
I have a m1010 that is mostly complete but it seems to be missing some switches that control the rear heater and ac.  There is one switch that comes out where the radio hole is and I was wondering what other switches should be there.  This switch has power but it doesn't do anything.  Or is there something else that I need to check to get these working?  
Thanks,
Dan

Answer
The rear heater in the ambulance is completely controlled from back in the rear of the ambulance compartment.

In the dash, the rocker switches that go there control right and left flood lights, and GPFU(Gas/Particulate Filter Unit) fan. That switch does probably operate a relay behind the dash, so make sure it is off when parked, or it will drain the battery.

Van