I don't think it really matters if you do it hot or cold mate, others may have differeing opinions. The other thing that can release an airlock is a bleed screw. Not too sure which motor you have, I have the 2.8TD and there is a rubber cap on one of the heater hoses up near the firewall on the drivers side, once that is off it releases the air lock on mine. I think the tb42's have one on the thermostat housing. Not to sure about the TD42's though.
Oh and the coolant will probably eat your lawn regardless mate, so try and catch as much as you can in a bucket or drum or sumink!I have one of those $5 flexible buckets from Supercheap which i find awesome for dropping the fluids out.
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