NISSAN 21477-VC810 Lower Radiator Fan Shroud

This genuine Nissan (SKU: 21477-VC810) lower radiator fan shroud (OEM designation: SHROUD-RAD,LWR) is a premium-quality original OEM component specifically designed to ensure the optimal operation of the vehicle's cooling system.

Function and Importance

The primary function of the lower radiator fan shroud is to guide and direct airflow. Positioned behind the cooling fan, it ensures that inducted air is drawn entirely through the radiator fins rather than escaping around the edges of the fan blades. This concentrated airflow is essential for efficient engine cooling, especially at low driving speeds or during stationary idling. In addition, the shroud provides physical protection for the fan blades and radiator core against gravel, mud, and road debris thrown up from underneath.

Technical Specifications

• Manufacturer: Nissan OEM
• Part Number: 21477-VC810
• Description: Lower Radiator Fan Shroud (SHROUD-RAD,LWR)
• Material: High-grade, heat- and chemical-resistant glass-fiber reinforced polymer/plastic composite engineered to withstand extreme engine bay temperature fluctuations.
• Fitting Position: Lower section of the radiator (LWR).
• Mounting: Engineered for original factory mounting points; requires no drilling or modifications.

Signs of Wear or Failure

Because the shroud is subjected to continuous thermal cycling and environmental exposure, the following issues may arise over time:

• Material Fatigue and Cracking: Thermal expansion, heat cycles, and vibrations can cause the plastic to become brittle and develop cracks.
• Mechanical Damage: Road hazards, kicked-up debris, or improper handling during maintenance can break mounting tabs.
• Engine Bay Noise: A loose or warped shroud may contact rotating fan blades, generating a plastic scraping or rattling sound.
• Engine Overheating: If the shroud is cracked, loose, or missing, airflow efficiency drops considerably, resulting in elevated engine operating temperatures.