i took off the white cap but its very difficult to remove the line from the cooling system. i wanna make sure im pulling on the right line too. I know the hot line is the supply and the cooler line is the return. and im pretty sure the top line is the supply line anyway. i also know to flush and fill to prevent pump malfunctioning. how do i pull the line out?

 

There is also this that is connected to the transmission lines, no idea what is is tho.