hi can any one help me my 2002 l322 has a flat battery, the fan in the car has a delay then works great, but when i get out of it and go away there is a fan under the bonnet that stays on all the time when i come back it will have a flat battery, some one said it is the hvack fan and all it needs is a new resisster range rover have this part but can any one tell me how and where to put it many thanks