Abstract: A vehicle heating system includes a heater plenum assembly externally attached to an engine exhaust pipe, to use exhaust heat to heat outside air flowing through the plenum into passenger cabin. The plenum includes a plurlality of aluminum plenum air tubes fastened to an air inlet manifold and air outlet manifold, with the assembly fastened against a portion of the exhaust pipe. A blower circulates unheated outside air through the plenum and, thereafter, the heated air into the cabin. Insulation around the plenum and adjacent exhaust pipe conserves heat.