Abstract: An air conditioning system for a motor truck for establishing thermally confortable conditions for an occupant sleeping on a berth provided in a driver's cab. The system includes an air duct for distributing part of the conditioned air to vicinity of the berth and a damper adapted to open or close the inlet of the air duct. The system may include a microcomputer for automatically controlling the temperature of the introduced air and distributing the temperature-controlled air optimumly by automatically causing the damper to open or close the inlet of the air duct depending upon whether the berth is occupied or not, the temperature outside the driver's cab and the temperature in the vicinity of the berth.

Abstract: An improved hot water heating system used with an internal combustion engine is disclosed. This system provides a hot water flow control arrangement in which hot water supplied to a heating radiator is controlled by a valve and a pressure responsive bypassing means to keep a comfortable temperature. The pressure responsive bypassing means is closed when the maximum heating capacity is required to avail to the heating radiator all the hot water supplied by the engine even when the hot water pressure increases to exceed a bypassing pressure level.