5.7L Engine

The 5.7L hydraulic cooling fan is integral to the fan shroud and is located between the radiator and the engine. See Figure.

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 FCM.

The hydraulic fan drive (motor) consists of the three major following components:

Steering flow control valve
Fan control valve
Two stage G-rotor hydraulic drive

The hydraulic fan and drive is not serviceable. Therefore any failure of the fan blade, hydraulic fan drive or fan shroud requires replacement of the fan module because the fan blade and hydraulic fan drive are matched and balanced as a system and servicing either separately would disrupt this balance.

Fig 1: Hydraulic Fan Fluid Flow Circuit

Courtesy of DAIMLERCHRYSLER CORP.

1 - POWER STEERING RESERVOIR

2 - POWER STEERING PUMP

3 - HYDRAULIC FAN DRIVE ASSEMBLY

4 - FAN BLADE

5 - HYDRAULIC FAN CONTROL SOLENOID

6 - POWER STEERING OIL COOLER

7 - STEERING GEAR

For hydraulic fluid routing information, refer to flow chart.

CAUTION: Do not attempt to service the hydraulic cooling fan or fan drive separately, they are serviced as an assembly. Failure to do so may cause severe damage to the hydraulic cooling fan assembly.