You arent supposed to bleed it with the engine running. Fill it up from cold using a header tank with all the bleeds open then lock them off in sequence with the rad first, then stat then the rear one by the engine mount when water flows in a steady stream. Leave the header tank in and run the car, keeping the water in the header tank higher than the heater matrix level (about halfway up a 2l coke bottle with the bottom cut off).
Let the theromostat open and let the fan kick in then switch off and let the car cool fully, then remove header tank and top up if necessary.
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