Bentley Bentayga A/C Compressor 4N0816303 7SAS17C
Part Number: 4N0816303 (and related codes like 4M0816803N)
Compressor Model: Denso 7SAS17C
For the Bentley Bentayga (2016–Present), the 7SAS17C is a common variable-displacement swashplate compressor manufactured by Denso. While it is used in several high-end VAG (Volkswagen Audi Group) vehicles, the Bentley specific part numbers ensure the correct mounting brackets and pulley offsets for the W12 or V8 engines.
1. Technical Specifications
The 7SAS17C is an electronically controlled compressor that does not use a traditional magnetic clutch in many configurations; instead, it uses an Electronic Control Valve (ECV) to vary output.
| Feature | Specification |
| Manufacturer | Denso |
| Compressor ID | 7SAS17C |
| Refrigerant Type | R1234yf (Standard for 2017+) or R134a (Early models) |
| Oil Type | PAG 46 (or ND-12 for R1234yf systems) |
| Oil Capacity | Approx. 150ml – 190ml (Verify via under-hood decal) |
| Voltage | 12V |
| Pulley | 7-Groove (Typically 110mm or 125mm diameter) |
2. Cross-Reference & Compatibility
The 4N0 prefix indicates this part was originally developed for the Audi A8 (D5) platform but is shared with the Bentayga due to the shared MLB Evo architecture.
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Bentley Codes:
4M0816803N,4M0820803N -
VAG Group Codes:
4N0816803A,7LA816803A -
Aftermarket Reference: Denso
DCP32087
3. Common Failure Symptoms
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Intermittent Cooling: Often caused by a failing Electronic Control Valve (ECV). The compressor itself may be mechanically sound, but the valve fails to regulate the displacement.
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Noisy Operation: A “grinding” or “whirring” sound that changes with engine RPM usually indicates bearing failure within the pulley.
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AC “Eco” Mode Stuck: If the car’s system detects a low refrigerant charge or a sensor fault (G395 Pressure Sensor), it will disable the compressor to prevent internal damage.
4. Installation & Service Notes
Mandatory Procedure: When replacing the compressor, Bentley (and Denso) guidelines state you must also replace the Receiver Drier and the Expansion Valve. If the old compressor suffered a mechanical “black death” internal failure, the entire system must be flushed to remove metal debris, or the new unit will fail within weeks.
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Refrigerant Note: Most Bentaygas use the newer, more environmentally friendly R1234yf gas. This requires specialized recovery and recharging equipment; you cannot use standard R134a equipment as the fittings are physically different.
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Oil Balance: New compressors often come “pre-filled” with oil. However, you must perform an “oil balance” (measuring what came out of the old unit) to ensure the system does not become oil-logged, which reduces cooling efficiency.
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