I have a 407sw, 2005, diesel car and having problem with it. The fan doesn’t switch off which in turns runs the battery down. I have dropped it into the dealership on a number of occasions but the are unable to find a problem. They have recommended to ‘unplugged’ the battery every time this happens. I have done this on a number of occasions however now the computer is acting up telling us lights not working, brakes not work etc. Any advice what I could do.