W163 ML320/ML350 (M112 engine) Coolant Flush, Water pump and Thermostat change

Sharing my experience in changing the water pump, thermostat and flushing the coolant on an 2002 ML320. The same procedure could be used on Mercedes Benz M112 engine which are in similar year/ of Class, E class, S class and variants. Please check your VIN for correct part compatibility. Link to video to show how to remove the fan and replace the serpentine belt: Link to instructions i used: Water pump