I have a 1998 520i touring estate, problem is with the heater/blower controls, all works fine but when i park up and leave the car it runs the battery flat within 2 hours, I have to remember to take out the fuse (no.9 in glovebox) if i dont take the fuse out when i return to the car the battery is flat every time, Ive been told its the relay but dont know where it is or even if thats the trouble, Can anyone help on this please, Many thanks Paul.