Condenser outside

Question

Aight,,, so i finally got power to it outstide,, now, to get it to work i had to bypass some wires,,,, from thermostat to furnace and then to outside we wind up with red and white wires.... both hace power,,, now,,, the white connects to and follows a blue wire.... blue wire goes down and inside this white tube lookin thing... this thing is attatched to copper pipe,,, another or possibly same wire comes out,,, thats where the power stops and fail to turn the motor on,,, what is that thing and is it replaceable,,,,???