Heater Plenum; The MOJAVE heater is designed to simplify the task of providing heat and comfort to your Hot Rod, Jeep or Utility Vehicle. It eliminates the need to locate hard-to-find parts, or go through expensive rebuilds to get old units in working order. Its design offers several mounting options, and the optional Plenum includes adjustable louvers and a flange for defroster ducting. The Mojave gets it heat from the hot water in your vehicle's cooling system, just like an OE unit, but has the advantage of fitting into a wide variety of confined spaces. Its compact size, ease of installation and operation make it the ideal replacement unit.