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I havent done the full system myself but believe the best way is to have it vacum filled
Or from what I have read try this.
Put heater to hot, take off expansion cap, undo bottom rad hose- allow to drain.
Flush through expansion tank with cold water on slow, until clear water seen.
Flush rad from top hose with cold water.
Undo 8mm bleed screw, fill until steady stream from bleed hole.
Close the bleed screw and fill tank to halfway between min and max.
Left the cap off and start engine, checked that heater is blowing hot.
Retop up and bleed again through 8mm bleed screw.
Run until fan comes on, .
the amount of O.A.T needed is about 4.5/5 litres.
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