Expansion tank

A damaged expansion tank – the tank used to conserve coolant - can cause leaks, and should be replaced at the first sign of wear.

We have been supplying the various auto parts for 15 years.

The purpose of the expansion tank is to protect and store excess coolant. It is a reservoir that stores the overflow of coolant caused by expansion when the liquid has reached a high temperature; without an expansion tank this excess coolant would leak onto the road. Coolant (an equal mix of antifreeze and water) is a liquid that circulates through the car’s cooling system to stop the engine overheating. The expansion tank catches the inevitable overspill of this all-important fluid and recirculates it around the engine. The engine’s cooling system works by heating the coolant in the radiator to its required operating temperature. When this temperature is reached the liquid expands and is forced out of the radiator through the radiator cap. This is where the expansion tank comes into play. It stores the excess coolant to ensure that the necessary fluid level remains within the system.

Are you frequently having to top up your coolant?

You could have a leak somewhere in the cooling system.

Check your expansion tank and if it’s leaking

We main work with auto parts suppliers and wholesalers also workshops for bulk orders.

Feel free to request a free catalog.

Guaranteed to fit the following models:

• 1998-2001 Audi A4 B5 1.8T
• 1998-2001 Audi A4 B5 2.8L V6 30v
• 1998-2001 Audi A6 C5 2.8L V6 30v
• 2003-2004 Audi RS6 C5
• 1998-2005 Volkswagen Passat B5 1.8T
• 2004-2005 Volkswagen Passat B5 TDI
• 1998-2005 Volkswagen Passat B5 V6

Replaces the following OE part numbers:

8D0121403L, 8D0121403F, 8D0121403J

Our bulk order package:

Our team:

Dated from 2010, through various acquisitions and the formation of strategic alliances, Pioneer become an independent owned Auto Parts Exporter, include automatic transmission filter , rebuild kits, oil pan and gasket

The timeline below illustrates Pioneer 's progression from inception to present day.

In 2010, in the 168 East Street, we started auto parts distribution business from a shop.

In 2011, We started sell transmission parts in China.

In 2012, We started to cooperate with China's leading auto parts manufacturers. In the same year, we started to sell transmission filters, oil oan, gasket, rebuild kit and so on.

In 2014, Xian Pioneer Automotive Industries Co.,ltd was established. we began to manufacture and sell automatic transmission filters. And started to export them to the Philippines, Thailand, Japan and Korea.

In 2016, We started selling transmission repair kits, Our products began to export to the United States, the Middle East and Eastern Europe.

In 2017, we established an engineering department to develop new customized products together with our customers. Wrap custom filters, oil pans and gaskets.

In 2019, We created the KEMMEX brand. And began to sell kemmex brand auto parts in the global market. And cooperate with more and more excellent leading enterprises.

Together, we will continue to the promotion and sales growth of the kemmex brand.

Pioneer,our goal is to simplify complex vehicle repair to keep the world moving.