C240 (7) 2001-2005. C320 (7) 2001-2005. SLK320 (4) 2001-2004. CLK430 (3) 2001-2003. S350 (1) 2006-2006. E320 (11) 1998-2005. Your water pump is a major component of your engine cooling system. If the water pump fails, the engine will overheat causing it to shut down.