Product Description for Coolant Expansion Tank Ensure optimal cooling system performance with our high-quality Coolant Expansion Tank, designed specifically for the Transporter T4 (1990-2003). This essential component helps maintain your engine's efficiency and longevity by effectively managing coolant levels and pressure. Explore the detailed features and benefits of this reliable replacement part: Perfect Fitment: Precisely engineered to replace the coolant expansion tank in Transporter T4 models from 1990 to 2003. Manufactured to meet standard specifications, ensuring a perfect match and seamless integration with your vehicle's cooling system. OEM Part Numbers: Compatible with OEM part numbers 1H0121321A, 1H0121321B, 1H0121321C, 701121407B, 701 121 407C, 357121321, 357121321A, 357121321C, and 2408. Guarantees compatibility and reliability, providing peace of mind and optimal performance. Essential Cooling Function: Designed to store excess pressure and coolant when your radiator heats up, ensuring balanced and efficient cooling system performance. Prevents overheating by maintaining ideal pressure levels, protecting your engine from potential damage. Enhanced High Performance: Keeps your radiator consistently full, preventing air ingress that can lead to oxidation and reduced efficiency. Enhances the overall performance and longevity of your radiator, ensuring smooth and reliable engine function. Easy Direct Replacement: Offers a straightforward replacement for original damaged or worn-out coolant overflow bottles. Helps avoid catastrophic cooling system failures, safeguarding your engine and ensuring peace of mind on the road. Upgrade your vehicle's cooling system with our Coolant Expansion Tank, designed for durability and reliability. Ideal for both automotive professionals and enthusiasts, this tank provides the quality and performance needed to keep your engine running smoothly. Choose our expansion tank for a dependable solution to your cooling needs, ensuring your Transporter T4 remains in top condition.