Hey Abdul,
It would help if you could be more specific, the coolant pipe is kind of a difficult one to make out. If possible please respond with the exact year, model and a picture of the location of where it is leaking and i will tell you what needs to be done to repair it. I can not tell if you are referring to a coolant hose, the thermostat housing or the water pump. Your question is a bit to general with not enough information.
I will tell point you to this video for changing a coolant hose in the hopes this is what you are referring to and to make it faster for you to begin to repair. Please let me know the information I asked above and I can help you more.
[link|https://www.youtube.com/watch?v=x0XbYvK7rCc|Replacing Coolant Hose Golf, VW, Audi|new_window=true]
I hope this helps!!
Cheers!
Moe