Hi so recently I have noticed that my c320 has a temperature issue in that it gets hot I'm in stop start traffic or not we to move fast enough to get the air going through the heater to cool it down it goes up to about a 100c I randomly get a water temp symbol appearing on the information display even when temp is around 85/90c. I pulled in to day when the temperature had risen to 100c didn't turn off the car but loosened the expansion bottle top carefully as I knew it was rosten the moment I loosened it and heard a little his the radiator fan sprung into life it's happened twice since this morning and same on every occasion as soon as I loosened the expansion bottle top the fan kicked in and the temp dropped. I've been trying to find some info on this all day and I haven't been able to find another person with the same issue. Has anyone got any ideas what it could be? Thanks in advance.