Are you talking about the Uno Turbo motor? If so,, are you then talking about the steel/metal water pipe running between the intake manifold and the manifold that connects with 2 size 13 bolts onto the water pump?? If so,,, you will need to loosen the boost clamps that's connected to the intake manifold, then loosen the breather pipe on the right top corner of the intake manifold, then you disconnect the high pressure fuel line from the fuel rail,, remove the heat shield bolted on with 2 size 10 bolts from the top where your injectors are then slide it out - with great difficulty that is if the firewall cover are still there - then loosen the 4 size 13 exhaust nuts and then slide the intake manifold out - also with some difficulty,, but there is a simple trick to do to prevent this in the future when it is removed - from there you will be able to access the coolant bolts,,

Really, I have to take the inlet manifold off to get to the coolant pipe? It's not a turbo but I guess the pipe layout is similar. It has all the inlet, exhaust and coolant pipes running underneath the carb, well injection unit. Crikey, thats a bit of a mission.

The attachment bolts to the waterpump are easily accesible bmo a long extension on a socket that extends to the passenger side of the vehicle. The extension (or even a long and short one coupled) must extend to approx in line with the end of the pipe you want to remove. Use a mirror to guide the socket onto the bolt heads and after that it is simply a case of remembering which way is loose! That bloody pipe is the bane of my life as it is victim to electrolytic corrosion and once corrosion has set in, that is pretty much end of story. Running the car on a very high quality coolant is the only way you can slow the process. Fiat Engineers should really read up on galvanic corrosion!