2006 silver Nissan pulsar. Head gasket is blown and although it starts most times on the first go, i

2006 silver Nissan pulsar. Head gasket is blown and although it starts most times on the first go, it overheats after 5-10 minutes and all the coolant boils away and steam comes from under the bonnet with the temp gauge right at the top stop. Rest of the car is fine.
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Croydon NSW