Mercedes-Benz Engine Coolant Thermostat - Borg Warner 407887D

Product Information

Thermostats are a simple device which regulates coolant flow through the engine. When cold it will stay closed, stopping coolant flow and helping the engine warm up faster. Once up to temperature, it will open and allow normal coolant flow and maintain proper engine temperature. Always install with the 'jiggle pin' bleed valve at 12 o'clock when possible.

For many applications, multiple temperature ratings are available. These ratings denote when the thermostat opens, and in extreme climates different temperature ratings can be used to assist the vehicle in maintaining proper temperatures. In very hot desert climates for instance, a lower temperature rated thermostat may be preferred.

There are two types of thermostat failures:

Thermostat stuck open (most common): Coolant will flow through the engine constantly from cold, preventing the engine from reaching operating temperature. Usually this means a rich mixture resulting in poor fuel mileage and potential catalytic converter damage.

Thermostat stuck closed: If the thermostat is stuck closed it will restrict flow into the engine resulting in an overheating condition, resulting in potential catastrophic engine damage.

• Overheating engine
• Engine not reaching optimal running temperature
• Radiator fan not engaging

About Borg Warner

BorgWarner Turbo Systems provides aftermarket customers worldwide with a comprehensive range of BorgWarner, 3K and Schwitzer replacement turbochargers and spare parts. They also provide the full range of EFR series and Airwerks performance products.

The world’s largest vehicle makers rely on the products made by BorgWarner. Their turbochargers are manufactured in line with stringent, globally acknowledged quality standards and meet the highest expectations.

Their products not only prove their above-average performance, reliability and long service life in the tough tests performed by the automotive industry, but also every day on streets across the globe. You can find these resilient qualities both in their OEM products and in all original spare parts and Reman turbochargers.

With their dense global network of authorized distributors throughout the world, they are available everywhere you need them. In 2014, Borg Warner, the supplier of automotive parts and systems had acquired Wahler, and as such is acquiring their inventory.