Differential with passive thermal-management system

A heating valve assembly comprising:

• a body including an inlet and an outlet;
• a valve including a metering portion disposed in the body between the inlet and the outlet and a driven portion external to the body, the valve being actuatable to change fluid flow through the body to heat the fluid;
• and
• an actuator arrangement configured to actuate the valve, the actuator arrangement including:
• a hydraulic cylinder defining a hydraulic chamber and an orifice opening into the chamber, and having a piston disposed in the hydraulic chamber, wherein the piston is biased in a first direction and is configured to move in a second direction in response to fluid pressure within the chamber overcoming the bias, and
• a drive mechanism connected between the piston and the driven portion, wherein movement of the piston in the first direction reduces fluid flow and movement of the piston in the second direction reduces fluid flow.