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Draining 5KTQ cooling fluid

While replacing the alternator on the 5KCSTQ (1986) I noticed that the steel
pipe that supplies coolant to the water jacket on the turbo was very rusty.
When I touched one of the rust flakes it dropped off, leaving an ornamental 
fountain of green fluid sprinkling though the grill.  While replacing it I 
thought it would be a good idea to drain the coolant and replace it with
phosphate free stuff.

Anyone got any tricks on how to completely drain the system?

Bently says to "loosen the hoses..." on the thermostat housing and heater
supply, but that does not seem to drain much.  As I want to change the coolant
type, I would like to get as much of the old stuff out as possible.