Quote:
Originally Posted by WOT Bimmer
That is a coolant hose. If you look at it close you can see that it comes from the radiator.
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Probably a coolant hose, but not to the radiator (that one is a much larger diameter hose to the front of the one indicated by the OP), and may go to the heater core inside the car.
Check the plumbing diagrams at RealOEM.com.