Audi Engine Coolant Expansion Reservoir Overflow Tank Direct Fit Plug And Play For Allroad Q5 A4 A5 Quattro 1.8L 2.0L 3.2L V6 L4 Replacement 8K0121403Q 8K0121403T 8K0121403D

Audi coolant reservoir direct-fit overflow tank, single unit
✔️ Direct plug-and-play replacement fits OE 8K0121403Q/3T/3D

This coolant expansion reservoir is a direct replacement part for specific Audi models. It captures overflow and helps maintain coolant pressure in the cooling system. Made from durable PP plastic and designed to match OE numbers 8K0121403Q, 8K0121403T, 8K0121403D, 8K0121403G, and V10-4478. Typical applications include 2011-2016 Q5, 2013-2016 A4/A5 Quattro 2.0L, allroad 2.0L, and 2012-2014 A5 1.8L.

✅ OE numbers: V10-4478, 8K0121403Q, 8K0121403T, 8K0121403D, 8K0121403G
✅ Material: high-quality PP plastic for durability and heat resistance
✅ Color: gray
✅ Function: coolant overflow expansion reservoir with direct-fit plug-and-play design
✅ Fitment: Audi 2011-2016 Q5, A4, A5 Quattro 2.0L and allroad 2.0L

💡 What is an Audi coolant expansion reservoir and why replace an OE 8K0121403Q family tank?

- Stores excess coolant and keeps pressure stable in the cooling system
- It allows coolant to expand and contract with temperature changes
- Replacing with an OE-style unit helps prevent leaks and overheating
- When shopping, match OE numbers like 8K0121403Q/3T/3D for proper fit