YEHERIT Front Coolant Expansion Tank 603-253 for Audi & VW - Translucent Polypropylene, Direct-Fit

YEHERIT 603-253 is a direct-fit pressurized coolant expansion/reservoir tank engineered to replace worn or cracked tanks on select Audi and Volkswagen models.

This replacement coolant reservoir (part number 603-253, compatible with OEM references 1K0121407F and 1K0121407A) offers a durable, lightweight polypropylene construction and a translucent finish so you can monitor antifreeze level at a glance. Designed for a bolt-on swap, it fits many Audi and VW vehicles across multiple model years without modification, making it a practical service part when the original tank leaks, becomes brittle, or fails to hold pressure.

Which vehicles will this expansion tank fit?

YEHERIT made this tank to match the mounting points and connections used on a wide range of Audi and Volkswagen models. Confirm fitment by comparing your existing part number or vehicle application before ordering to ensure correct compatibility.

• Audi: A3 (2006–2013, incl. Quattro), Q3 (2015–2018), RS3 (2018–2019), TT (2008–2015, incl. Quattro)
• Volkswagen: Beetle (2012–2019), Tiguan (2009–2018), Jetta (2005–2019 variants), Passat (1993–2019), Golf family (2010–2014 and variants)
• Matches OEM numbers: 603-253, 1K0121407F, 1K0121407A

How does the YEHERIT tank perform under heat and pressure?

The reservoir is molded from heat-resistant polypropylene designed to tolerate the operating temperatures encountered in engine coolant systems. Its pressurized design holds system pressure and reduces coolant loss when compared to degraded stock tanks.

• High-quality PP material resists cracking from thermal cycling
• Translucent body makes level checks quick and visual
• Engineered to accept standard coolant cap and hoses without modification

Is installation straightforward for a DIY mechanic?

Yes—this tank is a direct replacement intended to use the same fasteners, mounting tabs, and hose connections as the original unit. Basic tools are normally sufficient, and no custom fabrication is required when matching fitment with the original part.

• Bolt-on design aligns with factory mounting points
• No special adapters or seals required when OEM part matches
• Reduce shop time by replacing a failing tank quickly yourself

What practical benefits will I notice after replacing my damaged reservoir?

Replacing a cracked or leaky expansion tank restores coolant containment and helps maintain proper system pressure and engine operating temperature consistency. You’ll also gain easier visual monitoring thanks to the translucent construction, and avoid recurring coolant top-ups or roadside overheating risks associated with leaks.

• Stops coolant loss and related warning lights
• Helps preserve thermostat and water pump longevity by maintaining system pressure
• Transparent walls simplify level checks during routine maintenance

Who this is for: This YEHERIT 603-253 coolant reservoir is aimed at owners and technicians of compatible Audi and Volkswagen cars who need a reliable, cost-effective replacement for a failing factory tank. It suits DIY mechanics who want a straightforward bolt-on part, fleet maintainers keeping older vehicles in service, and anyone who needs to restore their cooling system’s integrity without expensive dealer parts.