OEM R33 and R34 (RB20/25) Viscous Fan Clutch.

It's a good design but after over 10 years of use, most are simply worn out. Some fail by becoming too loose resulting in the fan spinning slower, often eventually resulting in overheating and catastrophic engine damage. Others fail by locking down and spinning at full engine speed all the time. When this happens the increased drag will rob considerable power and you will hear the sound of a lot of air rushing at idle and low speed.

We also recommend checking and replacing the plastic mechanical fan blade that mounts to the fan clutch. Years of heat and stress often cause deep cracks in the plastic around the base or even the blades.

Fits:

• 1994-1998 Nissan Skyline R33 (RB20/25)
• 1999-2002 Nissan Skyline R34 (RB20/25)