Part Number: 4S0121254B

The 4S0121254B is a high-efficiency main engine radiator designed specifically for the Lamborghini Huracán platform. This radiator is a critical component of the vehicle’s sophisticated dual-circuit cooling system, engineered to manage the extreme thermal loads produced by the $5.2\text{L V10}$ naturally aspirated engine.

Technical Specifications

• Placement: Front-mounted (Typically side-specific; verify for Left or Right fitment based on the 4S0 series sub-designation).

• Compatibility: * Lamborghini Huracán LP610-4, LP580-2, and EVO models.

  • Shared platform compatibility with certain Audi R8 (4S) models.

• Core Material: High-grade aluminum with a high-density fin pitch for maximum surface area and heat transfer.

• Tank Material: Reinforced composite/plastic end tanks designed to withstand high pressure and vibration.

Key Performance Features

• Dual-Pass Design: Engineered to circulate coolant through the core twice, significantly increasing the temperature drop before the fluid returns to the engine block.

• Lightweight Efficiency: Optimized weight-to-cooling ratio to maintain the Huracán’s precise front-to-rear weight distribution.

• OEM Fitment: Features integrated mounting points for the cooling fan shroud and quick-release hose couplings for a leak-proof seal.

Professional Installation & Maintenance

When replacing the 4S0121254B, it is essential to use G13 or G12++ spec coolant (typically violet/lilac) mixed with deionized water. Because the Huracán utilizes a complex front-to-rear cooling path, the system must be vacuum-bled during refill to remove trapped air pockets, which can otherwise lead to localized engine overheating.