2003 W211 Mercedes E320 CDI (Diesel) overgeating

Question by larrylawrence posted 6 months 2 weeks ago in E-Class

Hi guys.

My E320 CDI overheats when I use the AC. It has a new and apparently functional radiator fan, adequate water level, no fluid leaks, nothing obvious. It goes from normal temp to overheating in one swift move, not gradually. As I am a newbie with diesel models, I haven't a clue as to why this is occurring. Any advice?