Temperature variations cause engine coolant to expand and contract, and the coolant expansion tank provides a space for the fluid to manage these changes. It is common for the plastic tank to develop splits, cracks, or even burst over time. If the tank fails, it can lead to coolant loss and significant engine damage. Additionally, a faulty cap can cause excessive pressure, which may also lead to the tank splitting.
The coolant expansion tank cap regulates the cooling system's pressure to increase the boiling point of the coolant while releasing any excess pressure to the atmosphere. These caps have a finite service life and should be checked as part of routine maintenance. They should also be replaced during any major cooling system repairs.
This Kit Includes
Specifications
Expansion Tank - 2D0121403K
| Additional Information |
With coolant level switch connection |
| Material |
Plastic |
| Includes |
Sensor |
| Forward/Backflow |
With backflow |
| Number of Pins |
2-pin connector |
| Connector Shape |
D-Shape |
Coolant Cap - 3B0121321
| Material |
Plastic |
| Colour |
Blue |
| Mounting Type |
Screw connection |
| Thread Type |
Outer thread |
| Includes |
Seal |
Part Numbers
Expansion Tank - 2D0121403K
| VW OE Number |
2D0121403K |
| topran Number |
109 341 |
| EAN |
4063926099523 |
Coolant Cap - 3B0121321
| Audi OE Numbers |
3B0121321, 95810644700 |
| topran Number |
111 023 |
| EAN |
4063926174916 |
Additional Information
Expansion Tank - 2D0121403K
| Brand |
topran |
| Quality |
Aftermarket + topran parts are quality inspected at HANS PRIES GMBH & CO. KG in Germany in accordance with DIN ISO 9001:2015
|
| Origin |
Made in China |
Coolant Cap - 3B0121321
| Brand |
topran |
| Quality |
Aftermarket + topran parts are quality inspected at HANS PRIES GMBH & CO. KG in Germany in accordance with DIN ISO 9001:2015
|
| Origin |
Made in China |
Fitment
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