kawasaki mule heater

[markct]

i made a heater for my kawasaki mule, its a sheetmetal box with two 12 volt fans that force air thru an automotive heater core, i was originaly planing to just tee into the two radiator hoses and run coolant lines to it that way but then i noticed that in the factory made heater kits they have one hose tee and a valve and elbow that look like they screw into a pipe thread port somewheres, i would assume in the engine block or waterpump. could someone with a heater installed in there mule take a look, or a picture and tell me where the heater is tied into on the kits, thanks guys