Key benefits - Function and reliability: The coolant reservoir stores coolant from the engine cooling system, accommodates expansion when the coolant is hot, and returns excess fluid to the radiator as the engine cools. - Problem prevention: If you experience leaks, low coolant level, or engine overheating, a faulty reservoir can be a contributing cause. - Sensor included: The unit ships with a sensor for monitoring. It is provided without a cap, and installation instructions are not included; professional installation is recommended. Compatibility - Mercedes-Benz C-Class (W204): C180 (2013-2015, 2011-2012), C200 (2010-2014), C230 (2008-2009), C250 (2012-2015), C250 (2010-2011), C280 (2008-2009), C300 (2008-2012), C300 (2010-2014), C350 (2012-2016). - Mercedes-Benz E-Class (W212): E200 (2012-2013, 2014-2016), E250 (2014-2016), E300 (2012-2016), E350 (2010-2016), E400 (2015-2017), E550 (2012-2017). - Mercedes-Benz CLS-Class: CLS350 (W218 2012-2014), CLS350 (W218 2012, etc). Reference part and package - Reference parts: Replace For ‎EPT0029, FRT2412C, Z49042, 210501061564, 2045000049, 2045000549, 2045000749, 603-257. - Package includes: 1 x Coolant Tank Reservoir without Cap, with sensor. Notice: instruction is not included. Recommended you install under the guidance of professionals. Replacement instructions - Turn off and cool down the car, disconnect the drain line, remove the retaining bolts, and swap in the new reservoir tank.