Kia Sportage: Coupling Assembly / Oil hydraulic Motor(Actuator) Description and operation
The 4WD ECM controls the Pump Motor Pump (Actuator) to generating an oil pressure.
The pressure engages a multiple disk clutch to transfer torque to the rear wheels.
The torque to the rear wheels varies according to the pressure on the clutch.

Inspection
All units are filled up with coupling fluid (ultra-low viscosity ATF)
prior to shipping. Inspect ...
Other information:
All tire pressures (including the spare) should be checked when the tires are
cold. “Cold Tires” means the vehicle has not been driven for at least three hours
or driven less than one mile (1.6 km).
Recommended pressures must be maintained for the best ride, top vehicle handling,
and mini ...
Replacement
1.
Disconnect the negative (-) battery terminal.
2.
Recover the refrigerant with a recovery/recycling/charging station.
3.
When the engine is cool, drain the engine coolant from the radiator ...