What H said above, but whenever I have burped the system, I've found that leaving the valve in the open position for 3 or 4 complete heat cycles gets rid of all the small air pockets lodged in the cooling system.
In fact, I normally leave the valve open for a few days, topping up little by little every day until the level stabilises before flipping it back.
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2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
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