How do you locate and change the turbo on a Renault master van?

Turbine is located behind the engine, best way to reach it is from below.

first you remove the intercooler hose and air intake hose, then unscrew the bolts that tighten it to the exhaust, and finally the bolts holding it to the heater.

now it should come out freely.

PS. the bolts can be hell to get loose, since they have heated hundreds of times through the years.. ;)

Good luck.