SYKRSS coolant reservoir tank with OE-style fit for seamless engine cooling replacement.
SYKRSS overflow tank assembly for Audi and VW engines supports safe coolant expansion.
SYKRSS PP plastic coolant reservoir emphasizes durability under heat and vibration.
SYKRSS cooling system expansion tank aids smooth coolant return to radiator.
SYKRSS coolant reservoir installed in vehicle for easy level visibility.
SYKRSS reservoir tank with clear sight line shows antifreeze level safely.
SYKRSS coolant reservoir improves heat management in engine cooling cycles.
SYKRSS coolant reservoir tank with OE-style fit for seamless engine cooling replacement.
SYKRSS overflow tank assembly for Audi and VW engines supports safe coolant expansion.
SYKRSS PP plastic coolant reservoir emphasizes durability under heat and vibration.
SYKRSS cooling system expansion tank aids smooth coolant return to radiator.
SYKRSS coolant reservoir installed in vehicle for easy level visibility.
SYKRSS reservoir tank with clear sight line shows antifreeze level safely.
SYKRSS coolant reservoir improves heat management in engine cooling cycles.

SYKRSS Coolant Reservoir Tank 1K0121407A — OE-Standard Expansion Tank for VW & Audi (A3, TT, Q3, Jetta, Passat, Beetle, Eos, Golf, Rabbit)

OverviewThe SYKRSS Coolant Reservoir Tank (OE-standard 603-253, part number 1K0121407A) is designed as a reliable replacement for...
Vendor: SYKRSS
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£48.95
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SYKRSS coolant reservoir tank with OE-style fit for seamless engine cooling replacement.

SYKRSS Coolant Reservoir Tank 1K0121407A — OE-Standard Expansion Tank for VW & Audi (A3, TT, Q3, Jetta, Passat, Beetle, Eos, Golf, Rabbit)

£48.95
SYKRSS coolant reservoir tank with OE-style fit for seamless engine cooling replacement.
SYKRSS overflow tank assembly for Audi and VW engines supports safe coolant expansion.
SYKRSS PP plastic coolant reservoir emphasizes durability under heat and vibration.
SYKRSS cooling system expansion tank aids smooth coolant return to radiator.
SYKRSS coolant reservoir installed in vehicle for easy level visibility.
SYKRSS reservoir tank with clear sight line shows antifreeze level safely.
SYKRSS coolant reservoir improves heat management in engine cooling cycles.

SYKRSS Coolant Reservoir Tank 1K0121407A — OE-Standard Expansion Tank for VW & Audi (A3, TT, Q3, Jetta, Passat, Beetle, Eos, Golf, Rabbit)

£48.95
Description
Description
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Overview

The SYKRSS Coolant Reservoir Tank (OE-standard 603-253, part number 1K0121407A) is designed as a reliable replacement for VW and Audi cooling systems. It aligns with original form, fit, and function, offering a practical upgrade when servicing the cooling circuit in compatible vehicles. Built to withstand daily driving demands, this reservoir is ready to integrate with your vehicle’s cooling loop.

Key benefits

  • Durable PP plastic construction stands up to heat and road vibration while keeping coolant secure.
  • Transparent level indicator lets you check antifreeze at a glance without opening the radiator cap.
  • Designed to store excess coolant and return it when the engine cools, supporting smooth pressure balance in the cooling system.

Because the expansion tank handles the working volume in the cooling loop, it can contribute to smoother heater performance and potentially lower stress on the engine from coolant mislevels. While results vary by vehicle and condition, these design features aim to support reliable operation.

Vehicle fitment: This reservoir is compatible with a wide range of Audi and VW models. Typical fits include Audi A3, TT, Q3, and Quattro variants, as well as TT RS and TTS. For VW, it covers Beetle, Eos, Golf, GTI, Jetta, Passat CC (2012–2019), Rabbit (2006–2009), and other listed models. Always use the compatibility filters in the listing to confirm suitability for your exact year and trim.

How it works

The expansion tank, often called the antifreeze reservoir, stores coolant that expands when hot and releases it back to the radiator as the engine cools. This helps maintain steady pressure and keeps the cooling loop balanced across driving conditions.

Quality and support

This SYKRSS part comes with a 12-month warranty and responsive customer service. If you have questions about fitment or installation, reach out and we’ll respond within 48 hours.

FAQ

Q: What vehicles is the SYKRSS coolant reservoir tank compatible with?

A: The reservoir fits Audi A3, TT, Q3, TT RS, and VW models such as Beetle, Golf, Jetta, Passat, CC, Eos, and Rabbit (see listing for full compatibility).

Q: Does this product come with a warranty?

A: Yes. It includes a 12-month warranty and responsive support; contact us and we’ll reply within 48 hours.

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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