Our Mk3 is almost 11 years old and so due a change to the coolant - FL22 stuff.
General opinion seems to be to change the coolant and the Cooling Radiator Expansion Tank at the same time as the tank can spring a leak around the neck and, ahem, upset the engine.
Is it simply a case of draining off the coolant, flushing a few times with distilled water and running the engine until warm and then re-filling with FL22 (or equivalent)
Is there anything else to do at the same time?