Hi, I'm new to the x5 scene. Just purchases a 2002 4.4 v8 sport model which I love. I have a few teething problems which will hopefully turn out to be nothing. I noticed when checking my coolant tank it was fairly low so topped up yesterday, this morning I went for a drive, a few hours after I got back I went past the car a noticed the expansion tank cap was hissing and the coolant had slightly dropped from max, is this normal? Secondly the sat nav keeps coming on and off as if I have a faulty connection or damaged cable, any idea of where to begin looking or a likely cause? Thanks Mark