Coolant Expansion Tank

This expansion (coolant reservoir) tank is designed for use in select passenger vehicles and replaces the factory coolant tank on systems where thermal expansion and fluid overflow need to be managed. It helps maintain proper coolant levels, allows for thermal expansion, and provides a location for coolant overflow and return.

Manufactured to OE-quality standards by Febi Bilstein, this tank is engineered for direct replacement and ensures reliable fit and function. Over time, original tanks can crack, leak, or the connection ports can become damaged, making replacement important to preserve engine cooling efficiency and prevent overheating.

Product Highlights

• OE-quality expansion tank from Febi Bilstein
• Designed to replace reference numbers such as 1K0 121 407 F / 1K0 121 407 on compatible models :contentReference[oaicite:1]{index=1}
• Features connectors for coolant return and overflow venting
• Recommended when original tank shows signs of cracking, warping, or coolant leakage
• Supports proper coolant circulation and thermal management