air conditioning compressor for Audi R8 and Lamborghini Huracan 4S0816803B

Part Number: 4S0816803B

The 4S0816803B is a high-performance air conditioning compressor shared across the Audi R8 (4S) and the Lamborghini Huracán platforms. Given the mid-engine architecture of these vehicles, the A/C system must work efficiently to counteract the significant heat soak from the $5.2\text{L V10}$ engine. This unit is designed to provide rapid cabin cooling while maintaining minimal drag on the engine’s power output.

Technical Specifications

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

   

  • Audi R8 (Type 4S): Gen 2 V10 and V10 Plus models ($2016$–present).

• Compressor Type: Swash plate variable displacement piston compressor.

• Refrigerant: R134a / R1234yf (check vehicle production date for specific gas requirement).

• Clutch Type: Electromagnetic clutch with a 6-groove serpentine pulley.

Key Performance Features

• Variable Displacement Technology: Unlike traditional compressors that cycle on and off, this unit adjusts its internal piston stroke to meet cooling demands precisely. This results in smoother engine operation and improved fuel efficiency.

• High-RPM Stability: Balanced internal rotating assembly rated for the $8,500\text{+ RPM}$ redline of the V10 engine, preventing internal failure during spirited driving.

• Vibration Dampening: Engineered with specialized mounting points to minimize the transfer of compressor NVH (Noise, Vibration, and Harshness) into the carbon-fiber/aluminum spaceframe chassis.

Professional Installation & Service Advice

Because the A/C lines in these mid-engine supercars run the entire length of the chassis to the front-mounted condensers, proper servicing is vital:

1. PAG Oil Balance: When replacing the compressor, you must measure the amount of oil in the old unit. The new 4S0816803B comes pre-filled with assembly oil, which may need to be adjusted to match the total system capacity ($160\text{ml}$–$200\text{ml}$ typically).

2. Replace the Receiver Drier: Whenever the A/C circuit is opened, the receiver drier/desiccant bag should be replaced to prevent moisture from acidifying the lubricant.

3. Vacuum Procedure: A minimum $30$-minute vacuum pull is required to ensure the long lines are completely free of air and moisture before recharging the refrigerant to the factory-specified weight.