High-quality aluminum radiator designed for the Audi A6 (newer models) with OEM reference 4F0 121 251 AF. It provides efficient engine cooling, excellent heat dissipation, and a precise fit for easy installation. Ideal replacement for maintaining optimal engine temperature and reliable performance.
Manufacturer / Part Number: Audi OEM Radiator 4F0-121-251-AF (sometimes also listed as variants like 4F0121251AA etc.)
Applications: Designed for Audi A6 (Sedan / Wagon) with 3.0 L or 3.2 L V6 engine in model years ~2005 through ~2011.
These are typical / known specifications or features, based on OEM and aftermarket data:
| Feature | Specification / Description |
|---|---|
| Core location | Front radiator, main engine cooling. (If listing “rear,” sometimes used to denote position in vehicle layout or aftermarket reference but this part is the main radiator.) |
| Engine compatibility | 3.0 L V6, 3.2 L V6 (naturally aspirated or supercharged depending on trim) |
| With/Without Transmission Oil Cooler | This radiator version includes the transmission oil cooler in many versions. |
| Material | Typically aluminum core with plastic end tanks (common OEM construction) — helps with weight, heat transfer, and cost. (Note: exact materials may vary slightly by supplier.) |
| Fitment Notes | Must match engine variant (3.0 / 3.2), mounting brackets, hose connections, and possibly whether it's a dual-pass or single-pass core, fan shroud attachments, etc. OEM specs ensure direct replacement without modifications. |
Exact OEM dimensions are not always publicly stated in full detail. Below are the commonly reported or derived specs / observations:
Mounting Points: OEM mounting points align with the chassis mounts for Audi A6 of those years; includes brackets for securing to frame, positions for coolant hose inlets/outlets, and sensor ports as needed.
Hose Connections: Top hose, bottom hose, possibly passthroughs for coolant sensors or lines. Must match original diameter and angle to avoid leaks or stress.
Cooling Capacity: Designed to dissipate heat for a V6 engine under load; includes capacity for coolant + coolant volume + transmission cooling (on versions with integrated cooler) to maintain proper engine operating temp under various conditions. OEM radiators are tested to ensure sufficient heat rejection at high RPMs and ambient heat.
Replacement units are available from both OEM suppliers and aftermarket manufacturers (for example Nissens) using this part number.
Prices vary based on source, condition, and whether transmission cooler is included. E.g. aftermarket new ones around US$140-240 depending on brand and retailer.
Exact part number match: 4F0121251AF (or compatible version).
Engine size and model year: Ensures hose positions, mounts match.
Integrated transmission oil cooler or not (if your car has one) — mismatch can lead to leaks or inefficiencies.
Condition: If buying aftermarket, check welding, end tanks, core fins (no clogging or damage), seal quality.
Warranty / fit guarantee: OEM parts often come with guarantee; aftermarket may vary.
