A vehicle thermal system includes a heat pump system in which a compressor, a first refrigerant switching unit configured to switch a flowing direction of a refrigerant, an outdoor heat exchanger, a first flow rate control unit, a second flow rate control unit, and a heat pump intermediate heat exchanger are connected in order, and which has a bypass circuit including a third flow rate control unit between the first flow rate control unit and the second flow rate control unit, a heat pump indoor heat exchanger, and a second refrigerant switching unit configured to switch between a discharge side of the compressor and an suction side of the compressor. The heat pump system has the refrigerant flowing therein and a heat medium circuit in which a liquid pump, a cooling heat exchanger, a heat medium indoor heat exchanger and a heat medium intermediate heat exchanger are sequentially connected.