VW Engine Coolant Thermostat Seal - Genuine VW N90303403

Product Information

A thermostat gasket is a sealing gasket located between the thermostat housing and the engine block. Its primary role is to create a tight seal that prevents coolant from leaking out of the thermostat housing, ensuring that coolant circulates properly between the engine and the radiator. The gasket is usually made from rubber, silicone, or paper-like materials and is designed to withstand the heat and pressure of the engine's cooling system.

• Coolant Leaks: The most common symptom of a failing thermostat gasket is a coolant leak. If the gasket becomes worn, cracked, or damaged, coolant may start to leak from around the thermostat housing, leading to visible coolant puddles under the vehicle or around the engine.
• Engine Overheating: A faulty thermostat gasket can cause coolant loss, leading to reduced coolant levels and overheating of the engine. The engine temperature may rise above normal operating levels, and if the leak is severe enough, the vehicle may overheat, potentially causing serious engine damage.
• Erratic Temperature Readings: A leaking thermostat gasket may cause the engine’s temperature to fluctuate. In some cases, the coolant may escape too quickly for the system to regulate engine temperature efficiently, leading to sudden changes in the temperature gauge reading.

About Genuine VW

The Volkswagen Group, also known as “VAG”, consists of Volkswagen, Audi, Lamborghini, Bentley, Bugatti, Porsche, Ducati, MAN, Scania, SEAT, and Skoda. The original parts used by VW to build your car are available as replacement parts under the “Genuine VW” brand. Manufactured under the direction of VW, expect excellent quality and a premium price since these parts are available exclusively through the VW Dealership network.

You may not realize this, but the parts that make up your VW are not necessarily manufactured by VW. No cause for concern, as VW designs the part, hires a manufacturer, and ensures its quality to you. In fact, many of these manufacturers have been making parts for VW 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 VW parts box and find an OEM branded part inside, simply with the addition of a VW logo.

Be sure to keep an eye out for OE tags on our product pages to quickly identify parts coming directly 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.