[piecesparts]

The reservoir is an important piece for your controls in the cab of a vehicle. It holds enough vacuum in reserve, to make up for those moments when your engine does not make good vacuum. This keeps the heating and air conditioning dampers from cycling to a different position, when the vacuum signal drops from the engine while climbing a hill or driving in heavy traffic. The newer vehicles have electronic controls on a lot of their dampers and controls and do not require as much vacuum as the older vehicles used to. If nothing else, put the reservoir under your floorboard to keep the volume of your vacuum available but the reservoir is out of site.