J Hidalgo,

Did you get the correct part for the bypass hose? I'm asking because the correct part is a special transition hose. The water pump end is a different diameter from the head end. If the piece has an MB pn on it, you should be okay if you could see a slight difference in size between the ends. Some shops have unknowingly put a straight piece on there only to find a leak path over time because the one end is oversized.

HTH,

someguyfromMaryland