The hydraulic fan (below picture) used on 2002 Jeep WG Grand Cherokee 4.7L replaces both the electric fan and the engine driven mechanical fan. The hydraulic cooling fan is integral to the fan shroud and is located between the radiator and the engine. The power steering pump supplies the hydraulic fluid and pressure to rotate the cooling fan blade, while the electrical part of the fan is controlled by the JTEC.
Hydraulic Radiator Cooling Fan and Fan Drive: 1. Power steering fluid cooler; 2. Radiator; 3. High pressure line from steering gear pump to hydraulic fan motor; 4. Hydraulic fan motor; 5. High pressure line from hydraulic fan motor to steering gear; 6. Fan shroud