I have a coolant leak from the connection at the back of the engine block, the plastic (looking part/pipe thing) that the coolant temperature sensor is attached to. Its really weird it leaks for about 30 seconds after i turn off my car then stops. What is the name of this part or part number? And how hard is it to replace?

 

That is the coolant flange. Do a search for more information than you'll know what to do with. DIYs are available.

 

Alright thanks