Radiator Fan: Operation: Notes
WARNING: This page is about a different car, the 2004 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
The hydraulic radiator cooling fan used on the 4.7L engine replaces both the electric fan and the engine driven mechanical fan. This provides 4.7L equipped vehicles with heavy trailer towing capability while at the same time reducing unnecessary power drain on both the engine and the vehicles electrical system.