An electric fluid pump for use in a motor vehicle, the electric fluid pump comprising: a pump housing defining a fluid chamber and a motor chamber, said fluid chamber being in fluid communication with a fluid inlet and a fluid outlet for providing flow of a coolant through said fluid chamber; an electric motor disposed within said motor chamber, said electric motor including a stator and a rotor, said rotor being supported for rotation relative to said stator by a rotor shaft extending along a longitudinal axis through said motor chamber; a single impeller fixed to said rotor shaft for rotation in said fluid chamber and operable to pump coolant from said fluid inlet to said fluid outlet; and a controller in closed loop communication with said electric motor; characterized in that said impeller is operable to rotate in a first rotary direction and an opposite second rotary direction in response to a signal from said controller, wherein the pumping efficiency of the impeller is greater in the first rotary direction than in the second rotary direction, so that said first rotary direction produces a first positive flow rate of coolant outwardly from said fluid outlet and said second rotary direction produces a second positive flow rate of coolant outwardly from said fluid outlet, and wherein said first positive flow rate is greater than said second positive flow rate, and in that said controller monitors a real-time rotational speed of said impeller and compares said real-time rotational speed with a predetermined target speed signal, said controller commanding said impeller to rotate in said first rotary direction when said target speed signal is greater than said real-time rotational speed, said controller commanding said impeller to rotate in said second rotary direction when said target speed signal is less than said real-time rotational speed. a pump housing defining a fluid chamber and a motor chamber, said fluid chamber being in fluid communication with a fluid inlet and a fluid outlet for providing flow of a coolant through said fluid chamber; an electric motor disposed within said motor chamber, said electric motor including a stator and a rotor, said rotor being supported for rotation relative to said stator by a rotor shaft extending along a longitudinal axis through said motor chamber; a single impeller fixed to said rotor shaft for rotation in said fluid chamber and operable to pump coolant from said fluid inlet to said fluid outlet; and a controller in closed loop communication with said electric motor; characterized in that said impeller is operable to rotate in a first rotary direction and an opposite second rotary direction in response to a signal from said controller, wherein the pumping efficiency of the impeller is greater in the first rotary direction than in the second rotary direction, so that said first rotary direction produces a first positive flow rate of coolant outwardly from said fluid outlet and said second rotary direction produces a second positive flow rate of coolant outwardly from said fluid outlet, and wherein said first positive flow rate is greater than said second positive flow rate, and in that said controller monitors a real-time rotational speed of said impeller and compares said real-time rotational speed with a predetermined target speed signal, said controller commanding said impeller to rotate in said first rotary direction when said target speed signal is greater than said real-time rotational speed, said controller commanding said impeller to rotate in said second rotary direction when said target speed signal is less than said real-time rotational speed.