Few months back I posted about a problem that with coolant leaking but I couldn't find the source. Well, I found the source and it was the black hard plastic flange connecting the radiator hose, heater hose and other hoses to it. There was about 4-5 different hoses connected to that flange. Anyway, the flange itself is okay but the rubber inside that appears to be the gasket has gone bad and according to VW dealership, this part normally goes bad after 5 years. Now, if you are replacing this flange, dealership recommends that you also buy two new o-ring rubber coils for the sensors. Parts cost me $15 with taxes and about 20 mins to replace.