Buy a long-ish length of
clear plastic tubing, about the same with as ordinary garden hose.
Cut one end flush, and the other long enough to come down to wheel hub level. Feed the hose down into the overflow tank until it stops (tap it to make sure it is at the bottom). Use a suction bulb (Bunnings) attached to the free end and repeatedly work this while jiggling the hose up and down a little. This should start a drain of the coolant overflow.
DO NOT SUCK THE HOSE BY MOUTH.
Removal of the tank is otherwise up on the hoist: it's infuriatingly fiddly, with a virtual Houdini act getting it out and back in without seriously scoring the plastic and thus causing a leak. Same again with the windscreen washer bottle (installed from below, on hoist, with twists, turns, shoves, profanities and more twists still than a corkscrew...
).
Refill the bottle to the MAX line with replacement coolant (red).
Note that red coolant for the VZ Alloytec is
NOT the same as the DEXCOOL solution (yellow) used in VF engines.