Question about 1999 Jeep Grand Cherokee

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1999 jeep grand cherokee laredo is engine fan belt driven or electric?

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Andy Lebel

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The radiator cooling fan used on the 4.0L engine is
an hybrid fan design. The hybrid fan system consist
of a low speed viscous driven mechanical fan and a
electrical fan.
The hydraulic fan used on vehicles equipped the 4.7L engine, 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. The hydraulic fan drive (motor) consists of the three major 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.

Posted on Oct 30, 2009

  • Planenut Dec 11, 2010

    I can drive my 04 grand Cherokee all day around town and it is fine. However, after a little time on the interstate at around 70 mph, when I slow down, the fan is making a horrible loud noise. I can shut off the engine and restart it immediately and the noise is gone. What is different about the interstate driving that causes this and what do you think needs to be replaced? Sorry,Yes it is the 4.7 with the hydraulic fan.

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