my C3 03 module has decided to stop cooling the engine. Coolant fan not working and I've been told sensors and fan / raditator come as one unit and would all need replaced if one part is broken. Seems a bit severe to me. any options or things to try by my 'self'. Other option is not to be in stationary traffic as temperature guage and warning beep on full alert. cools quick when i move heat to interior or start driving again.