The rear coolant heater has its pull switch thru the metal part of the dash in the lower, drivers side corner near the drivers door. Basically at or just above where the drivers side A/C register would go. Simple two speed pull switch with a white, cylindrical knob that looks like a little thread spindle. First position is high speed; second position is slow speed. Its fan pulls interior air thru the core.
The unit itself is pretty good size. I haven't ever removed it, but I'm pretty sure its bracket holes line up with captive nuts in the floor for easy mounting. I haven't verified that factory captive nut setup, though. Hoses come up thru the floor underneath the heater unit. They "T" off of the main heater core hoses with "Y"s that angle the hoses back towards the inside of the frame to run along the passenger channel until past the xfer case where they can curve towards the middle of the body. The rear heater hoses have slip covers that insulate them from heat and abrasions. No separate heater hose shutoff valve involved. BTW, the heater tucks under the 2nd seat so its always out of the way.
Nice option, IMO. If I had a digicam, I'd have posted a pic.
