BMW Engine Expansion Plug - Genuine BMW 07119919031

Product Information

BMW Engine Block and Components diagram for 323Ci, 323i, 325Ci, 325i, 325xi, 328Ci, 328i, & more

An engine expansion plug, also known as a freeze plug or core plug, is a small, round metal or rubber disc inserted into the engine block. Its main function is to seal off passages created during the manufacturing process of the engine block, where sand cores were used to create the internal coolant channels. Additionally, expansion plugs offer some protection against cracking in extremely cold temperatures by allowing room for expanding coolant if it freezes.

• Coolant Leaks: A common sign of a failing expansion plug is a visible coolant leak around the plug area. You may notice coolant pooling underneath the engine or dripping from the plug location
• Overheating Engine: Leaking coolant due to a failed expansion plug can lead to reduced coolant levels, which can eventually cause the engine to overheat due to insufficient cooling

About Genuine BMW

The original parts used by BMW to build your car are available as replacement parts under the “Genuine BMW” brand. When ordering a Genuine BMW part you are guaranteed to get the same part that you would pick up from your local dealerships part department. Genuine BMW parts have been built to BMW’s stringent standards and are the same quality of the original parts used to build your Ultimate Driving Machine.

You may not realize this, but the parts that make up your BMW are not necessarily manufactured by BMW. No cause for concern, as BMW designs the part, hires a manufacturer, and ensures its quality to you. In fact, many of these manufacturers have been making parts for BMW for decades. In our industry these manufacturers are called OEM (Original Equipment Manufacturers), and these are often brands you recognize, including Lemforder, ZF, Sachs, Bosch, Valeo, Zimmermann, Siemens VDO, Corteco, and more. Don’t be surprised to open that Genuine BMW parts box and find an OEM branded part inside, simply with the addition of a BMW logo.

Be sure to keep an eye out for OE tags on our product pages to quickly identify parts coming direct from OE manufacturers. That extra bit of insight could save you some serious money while shopping! Refer to our OE Academy for further information regarding the OE/OEM tags throughout the site.