INTERESTING BMW COOLANT MYSTERY-SEXY RIDE 2012 650I This customer went to 2 shops including the BMW dealer and could get no conclusion to his coolant issues, except go spend lots of money and the other shop could find no leak. He dropped off to us so we went to work the next day and we found the radiator had a leak from side seam, as you can see in the photo. Also when you remove the “hoses,” and you will see why I am quoting “hoses” to say the least, BMW has a liking for “hoses.” You replace whatever hoses go to that radiator…you will see why in the next pictures.