Radiator – 8K0 121 251 L
Radiator for the Audi A4 (B8) / A5 / Q5 platform, OE number 8K0 121 251 L. Main group 121 sub-group 251 identifies this as a radiator. Revision index L. Cooling capacity and mounting differ between engine variants on the same platform — confirm against your engine code before ordering.
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Technical specifications
| Part Number | 8K0 121 251 L |
| SKU | AUD-8K0121251L |
| Brand | |
| Category | Radiators |
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3–5 business days. Free on orders over $150.
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Order before 2 PM for next business day delivery.
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Customer reviews
Verified feedback from Audi owners and independent workshops.
4.5
4 reviews
Thomas Bauer
August 6, 2026
Solved my overheating
Fitted to my 2019 A6 C8. The transmission cooler lines threaded straight in with no adapters. I pressure tested it to 1.4 bar before fitting and it held without a drop. Result is no more creeping temperature when towing. Would order again without hesitation.
Oscar Vance
May 4, 2026
Temps back to normal
Ordered this for my A4 B8 after the original gave up at 42k. Front end off, old one out, this one in over a long Saturday. I pressure tested it to 1.4 bar before fitting and it held without a drop. Result is the coolant level has not moved in four months.
Viktor Ibrahim
June 17, 2025
Better core than the original
Bought for a 2020 S3 8V. All the mounting points and hose stubs lined up without any persuasion. The end tanks are properly crimped with clean seams all the way round. Result is the coolant level has not moved in four months. Good value against the dealer price.
Martin Delgado
June 3, 2025
Straight swap
Second one of these I have bought, this time for the A5 8T. I flushed the system properly and refilled with the correct G13 before bleeding. The plastic feels substantial rather than the brittle stuff that cracks at the neck. Result is intake temps dropped noticeably on a long motorway pull.