There isn't one. You turn your heater to max hot, then let your engine warm up to operating temperature with the radiator cap half closed. Top up as required. Keep running the engine and checking the coolant in the radiator by taking off the cap (ONLY if you had the cap on half closed. If it was fully closed, don't open it as coolant will spray out). Once there are no more bubbles, then you're all set.
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