Gabriel S Class

HELLO Dear MB fans.My right hand side headlamp fan is running nonstop for a couple of days when full lights are on and it will only stop when the daytime running lights are working.I was told to change the fan inside the headlamp but the person who told me said it might also be the headlamp module.There is no error on the dashboard and when the Star diagnostic was plugged in there wasn’t any error or fault code coming from the headlamp.The fan will run non stop only for the right hand side headlamp.Any suggestions???Thanks