Audi A3 8V VW Golf VII Seat Leon 5F Coolant Expansion Tank with Cap 5Q0121407F / 5Q0121407G

Product overview

A new coolant expansion tank (reservoir) with cap, referenced to OE-reference numbers 5Q0121407F, 5Q0121407G and 5Q0121407M. It is listed for a large number of Volkswagen Group cars built on the MQB platform, including the Audi A3, VW Golf VII and Seat Leon. Over time these plastic tanks can become brittle, crack along their seams or develop leaks around the outlets, leading to coolant loss and overheating warnings.

Vehicle compatibility

Listing data covers 200 applications. Examples include the Audi A3 8V hatch, Sportback, Limousine and Convertible (2012 onwards, including S3 and RS3), Audi TT and Q3; VW Golf VII and Golf VII Variant, Passat B8 and Alltrack, Tiguan and Caddy; Seat Leon 5F, Leon ST, Ateca and Tarraco; and Skoda Octavia III, Superb, Karoq and Rapid. Petrol, diesel and gas-fuelled engines from 1.0 TSI to 2.0 TSI and 1.6/2.0 TDI are represented. A small number of entries for other makes appear in the data and should be disregarded. Confirm by OE-reference number or VIN before ordering.

Key features

• Plastic expansion tank supplied with cap, as listed
• Part of the engine cooling system
• Three OE-reference numbers listed for easy matching
• New condition

Technical specifications

Installation requirements

Never open the cooling system while the engine is hot. Drain enough coolant to lower the level, unclip the hoses and sensor connector, and release the tank from its mounts. Transfer the level sensor if it is not supplied. Refill with the coolant type specified for your vehicle and bleed the system as per the manufacturer's procedure.

Fitment checks before ordering

Expansion tanks vary between engines and model years. Please check your existing tank's part number or supply your VIN to confirm fitment before ordering.

Package inclusions

Expansion tank with cap, as listed. Level sensor and hoses are not included unless stated.

Shipping information

Shipped from China to customers in Australia and New Zealand. Freight is calculated at checkout based on your delivery address, and actual freight is confirmed at the time of order.

Special Order Item

This product is a special-order item sourced specifically for your vehicle. Please allow an estimated lead time of 3-4 weeks for sourcing and delivery. Lead times are estimates and may vary depending on supplier availability, order processing, and international shipping. We recommend confirming availability before placing your order.