It can be your glow plugs need replacment.
you may have a wiring problem or you just need to diagnose your merc and see if any small errors came up. If they do just delete them.
The 2010 Mercedes-Benz Sprinter's turning circle is 47.6 ft..
The 2011 Mercedes-Benz Sprinter's turning circle is 47.6 ft..
The 2014 Mercedes-Benz GL-Class's turning circle is 40.7 ft..
The 2011 Mercedes-Benz C-Class's turning circle is 35.6 ft..
The 2014 Mercedes-Benz SLK-Class's turning circle is 34.5 ft..
The 2005 Mercedes-Benz SLK-Class's turning circle is 34.5 ft..
The 2011 Mercedes-Benz GL-Class's turning circle is 39.7 ft..
The 2012 Mercedes-Benz SL-Class's turning circle is 36.2 ft..
The 2007 Mercedes-Benz S-Class's turning circle is 40.0 ft..
The 2007 Mercedes-Benz GL-Class's turning circle is 39.7 ft..
The 2010 Mercedes-Benz CL-Class's turning circle is 38.2 ft..
The 2002 Mercedes-Benz C-Class's turning circle is 35.3 ft..