I have been leaking coolant ever since i first bought my car (2000 e46 318i) coolant is leaking onto floor directly under heater behind engine. Currently needing to fill up about a litre every 2-3 days. Had it checked today and mechanic said i need a new plastic pipe or something that runs from the front of engine to the back of engine. Have to dismantle everything to see properly but havent done so yet. Wanting to know the name of that part and price please. And other questions and info will be great.