210 589 00 91 00 Test cap - WS20.00-P-0017B
WARNING: This page is about a different car, the 2012 Mercedes-Benz C300, 2011 Mercedes-Benz C300, 2010 Mercedes-Benz C300, 2009 Mercedes-Benz C300, and 2008 Mercedes-Benz C300. However, it is still accessible from the selected car via links, so may be relevant.
FG 01/20/Set B
MODEL 124, 129, 140, 163, 164, 166, 170, 171, 172, 197, 199, 202, 203, 204, 207, 208, 209, 210, 211, 212, 215, 216, 218, 219, 220, 221, 230, 240, 251, 461, 463 with screw cap on expansion reservoir
MODEL 639 with ENGINE 112, 272, 642, 646 with screw cap on expansion reservoir
MODEL 636 with ENGINE 646 with screw cap on expansion reservoir
Use:
Test connection with thread for coolant expansion reservoir to testing unit 124 589 24 21 00 and filling device 285 589 00 21 00.