seriously, could you be any more vague? luckily i still know what it is you are asking about. the 2 wires on the back of the block are for the coolant fan switch, and it tells the radiator fan to kick on. the b1 has this 2 prong connector located on the thermostat housing. you need to move/extend these wires from the back of the block, over to the new location. if you don't your rad. fan will never kick on.