BSNOVT Radiator Overflow Hose cooling-breathe-tube enhances engine cooling.
BSNOVT Coolant Expansion Tank Bypass Line directly replaces OE part.
BSNOVT Audi A4 compatible hose fits cleanly in the engine bay.
BSNOVT A4 Quattro connection hose secures efficient coolant routing.
BSNOVT A4 Allroad compatibility hose matches rugged road use.
BSNOVT A5 Quattro hose ensures consistent coolant flow.
BSNOVT A5 Sportback hose supports steady engine temperature.
BSNOVT Radiator Overflow Hose cooling-breathe-tube enhances engine cooling.
BSNOVT Coolant Expansion Tank Bypass Line directly replaces OE part.
BSNOVT Audi A4 compatible hose fits cleanly in the engine bay.
BSNOVT A4 Quattro connection hose secures efficient coolant routing.
BSNOVT A4 Allroad compatibility hose matches rugged road use.
BSNOVT A5 Quattro hose ensures consistent coolant flow.
BSNOVT A5 Sportback hose supports steady engine temperature.

BSNOVT Radiator Overflow Hose – Cooling Breathe Tube, OE Replacement for Audi A4/A5 Quattro (2017-2021)

Overview The BSNOVT Radiator Overflow Hose, also known as the cooling breathe tube, is designed to channel...
Vendor: BSNOVT
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£38.75
£38.75
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BSNOVT Radiator Overflow Hose cooling-breathe-tube enhances engine cooling.

BSNOVT Radiator Overflow Hose – Cooling Breathe Tube, OE Replacement for Audi A4/A5 Quattro (2017-2021)

£38.75
BSNOVT Radiator Overflow Hose cooling-breathe-tube enhances engine cooling.
BSNOVT Coolant Expansion Tank Bypass Line directly replaces OE part.
BSNOVT Audi A4 compatible hose fits cleanly in the engine bay.
BSNOVT A4 Quattro connection hose secures efficient coolant routing.
BSNOVT A4 Allroad compatibility hose matches rugged road use.
BSNOVT A5 Quattro hose ensures consistent coolant flow.
BSNOVT A5 Sportback hose supports steady engine temperature.

BSNOVT Radiator Overflow Hose – Cooling Breathe Tube, OE Replacement for Audi A4/A5 Quattro (2017-2021)

£38.75
Description
Description
x

Overview

The BSNOVT Radiator Overflow Hose, also known as the cooling breathe tube, is designed to channel excess coolant from the engine to the expansion/overflow reservoir. Built to endure high engine temperatures and daily road vibrations, this hose supports steady temperature management and helps maintain a balanced cooling system without altering the vehicle’s core design.

As an OE replacement, it directly substitutes the OEM part 8W0121081AN, offering a hassle-free swap for select Audi models. The materials and construction are chosen to perform reliably under demanding driving conditions, giving you a practical upgrade that aligns with your vehicle’s original cooling design.

Fitment at a glance

  • Compatible with Audi A4 (2017-2020)
  • Audi A4 Quattro (2017-2021)
  • Audi A4 allroad (2017-2020)
  • Audi A5 Quattro (2018-2020)
  • Audi A5 Sportback (2018-2020)

Why this hose matters

  • Directs excess coolant to the overflow reservoir, supporting engine temperature regulation during hot days or spirited driving
  • Direct OE replacement ensures a precise fit and dependable performance with minimal modification
  • High-temperature-resistant materials resist engine heat and road vibrations for lasting durability
  • Single-hose package simplifies installation and provides a clean, straightforward replacement path

Easy installation and care

This kit is designed for a straightforward swap on the original 8W0121081AN line. Before installing, inspect routing paths and end connections for wear, cracks, or leaks to ensure a proper seal.

Quality you can rely on

BSNOVT focuses on practical automotive components that support reliable cooling performance. This hose combines sturdy materials with a thoughtful design to help you handle daily commutes and longer trips with confidence.

FAQ

Q: Which vehicles is the BSNOVT Radiator Overflow Hose compatible with?

A: Compatible with Audi A4 (2017–2020), A4 Quattro (2017–2021), A4 allroad (2017–2020), A5 Quattro (2018–2020), and A5 Sportback (2018–2020).

Q: What does the kit include and what is its purpose?

A: Includes one coolant hose; replaces OE 8W0121081AN and directs excess coolant to the overflow reservoir to support proper engine temperature.

Shipping & Return
Shipping & Return
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Returns Policy

You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.

Shipping

We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

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