I'm afraid I have a coolant leak, but oddly enough it is on the driver's side, right next to the transfer case. At first I thought it was just running down the engine, along the frame, and onto the ground. I got under the car and looked though, and there is actually a pipe there and the coolant is slowly dripping out of the pipe. I only notice if I let my car sit for a long period of time. Does anyone know what this pipe is or where it connects to?

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2006 BMW X5 4.8is