The other day I was adding freon to my '89 735IL and it began to leak out of the top of the accumulator. The point that the freon was escaping was a small pin hole in the center of a 14mm bolt facing the front of the car. This bolt was attached to a square piece that sat on top of the accumulator. Why would a hole be in the center of this bolt? How can I find a new bolt with no pin hole or is it sapposed to be there? Help! Fellow 7 Owners- Dave Huntington Beach, CA