Radiator – 8K0 121 251 AL
Radiator for the Audi A4 (B8) platform, OE number 8K0 121 251 AL. Main group 121 sub-group 251 identifies this as a radiator. Revision index AL. Cooling capacity and mounting differ between engine variants on the same platform — confirm against your engine code before ordering.
Next-day dispatch
30-day returns
Secure checkout
Fitment checker
Confirm this part fits your specific Audi — including the engine code — before ordering.
Confirmed fitment
Technical specifications
| Part Number | 8K0 121 251 AL |
| SKU | AUD-8K0121251AL |
| Brand | |
| Category | Radiators |
Shipping & returns
Standard shipping
3–5 business days. Free on orders over $150.
Express delivery
Order before 2 PM for next business day delivery.
Easy returns
Return unused parts within 30 days for a full refund.
International
We ship worldwide. Duties may apply at destination.
Customer reviews
Verified feedback from Audi owners and independent workshops.
3.8
5 reviews
Patrick Silva
March 11, 2026
Solved my overheating
My A5 8T needed this doing at 82k miles. The core is thicker than the unit it replaced and the fin density is noticeably higher. All the mounting points and hose stubs lined up without any persuasion. Result is the coolant level has not moved in four months. Delivery was quick too.
Tobias Osei
November 28, 2025
Holds pressure beautifully
Went on my Q5 8R 1.8 TFSI at 162k miles. The end tanks are properly crimped with clean seams all the way round. I bled it through the proper procedure and it has held level ever since. Result is the coolant level has not moved in four months. No complaints at all.
Laura Okonkwo
October 22, 2025
Perfect fit, no modification
Fitted to my 2012 A4 B8. All the mounting points and hose stubs lined up without any persuasion. The plastic feels substantial rather than the brittle stuff that cracks at the neck. Result is the coolant level has not moved in four months. No complaints at all.
Owen Castellanos
August 24, 2025
Works well, packaging was thin
Went on my TT 8J 1.8 TFSI at 81k miles. All the mounting points and hose stubs lined up without any persuasion. The core is thicker than the unit it replaced and the fin density is noticeably higher. On balance intake temps dropped noticeably on a long motorway pull. Good part, minor niggles.
Owen Delgado
May 26, 2025
Temps back to normal
My A3 8P needed this doing at 53k miles. All the mounting points and hose stubs lined up without any persuasion. The core is thicker than the unit it replaced and the fin density is noticeably higher. Result is no more creeping temperature when towing. No complaints at all.