Sort of awake....
If you can get the bottom radiator hose off then changing the coolant is easy, using a 50% mix of quality antifreeze and water.
I think there's a bleed screw on the 306 - on the top of the thermostat housing. This is slackened to let any air out when refilling. Its worth looking for other bleeds on the heater hoses too - I don't know if there are any or not!
John
If you can get the bottom radiator hose off then changing the coolant is easy, using a 50% mix of quality antifreeze and water.
I think there's a bleed screw on the 306 - on the top of the thermostat housing. This is slackened to let any air out when refilling. Its worth looking for other bleeds on the heater hoses too - I don't know if there are any or not!
John